Disposal, fund raising and directorate change

14 July 2010

                                  Corero PLC                                   

                          ("Corero" or "the Company")                          

          £6.5 million fund raising, disposal and Directorate change           

Corero (AIM: CORO), the specialist provider of software solutions to the
education and banking and securities markets, today announces a number of
interrelated transactions, including fund raisings to inject £6.5 million
(before expenses) of new capital, the disposal of the Financial Markets
division and the appointment of new directors.

Fund raising:

  * £6.5 million raised by a Placing (£2.0 million) and Subscription (£4.5
    million).
   
  * £2 million 8% convertible unsecured redeemable loan stock converted into
    ordinary shares.
   
  * the Company will be debt free post transactions.
   
Disposal:

  * Financial Markets division sold to Brokerhorse Limited, a subsidiary of
    Rivington Street Holdings plc - consideration is the assumption by
    Rivington of £2 million of the Company's CULS.
   
Directorate change and management team:

  * Appointment of Jens Montanana as non-executive director.
   
  * Appointment of Andrew Miller as executive director responsible for finance,
    operations and M&A.
   
  * New directors and management team have extensive experience in technology,
    sales, marketing, finance, acquisitions, business integration and
    operations.
   
  * Mark Robertson, Managing Director of the Financial Markets division will
    resign from the Company and transfer to run the business in Rivington.
    Peter Waller, Richard Last and Bernard Snowe will remain on the board.
   
Future strategy and prospects

  * Invest and grow the Business Systems division
   
  * Develop through a buy and build strategy a network security solutions
    business. 
   
  * 
      + Sector should continue to grow as security threats proliferate and the
        market demand for evolved security products increases. 
       
  * Focus on delivering high growth solutions (with related services providing
    recurring income) to mid-market and larger customers as well as
    telecommunications service providers.
   
A circular setting out full details of the Proposals and convening the General
Meeting and the CULS Meeting will be posted to Shareholders today. The
Proposals are conditional on Shareholders and CULS Holders approvals of the GM
Resolutions and the CULS Resolutions respectively. On Admission, Jens Montanana
and his associates will hold 56 per cent. of the Enlarged Issued Ordinary Share
Capital and Jens Montanana, personally, will hold 32 per cent. of the Enlarged
Issued Ordinary Share Capital. Admission is expected to become effective and
dealings in the Enlarged Issued Ordinary Share Capital is expected to commence
on AIM on 9 August 2010. Defined terms in this announcement are set out below.

Jens Montanana, proposed non-executive director, commenting on the transaction,
said

"The network security market has witnessed sustained growth - this is set to
continue as demand for evolved security products increases. Corerois ideally
positioned to develop a network based internet security product business
alongside the existing Business Systems division.

"Our strategy is to focus on mid to upper tier solutions targeting high growth
segments and business critical applications - the support we received for the
Placing is a clear demonstration of the interest in this sector of the software
market".

Peter Waller, Chairman, commenting on the transaction, said

"Thesetransactions enable the Company to realise value from the sale of the
Financial Markets division and the proposed conversion of the remaining loan
stock to equity will mean the Company will be debt free.

"The injection of £6.5 million will allow the Company to invest in, grow and
better optimise the Business Systems division as well as to focus on developing
a network security solutions business.

"The Company has attracted a very experienced management team to execute the
future strategy and I look forward to working with the team."

Enquiries:

Corero plc                                                                   
                                                                             
Peter Waller, Executive Chairman                           Tel: [phone]
                                                                             
Andrew Miller, proposed Executive Director                                   
                                                                             
Merchant Securities Limited (Nominated Adviser and Broker)                   
                                                                             
John East / Simon Clements                                 Tel: [phone]
                                                                             
finnCap Limited (Placing Agent)                                              
                                                                             
Tom Jenkins / Sarah Wharry                                 Tel: [phone]
                                                                             
College Hill                                                                 
                                                                             
Matthew Smallwood/Adrian Duffield                          Tel: [phone]

Introduction

The Company announces that it had entered into a conditional sale and purchase
agreement to dispose of the business and assets of the Financial Markets
division of its trading subsidiary to Brokerhorse Limited, a wholly-owned
subsidiary of Rivington Street Holdings plc. The Disposal is conditional upon,
amongst other things, Rivington Street Ventures Limited assuming the liability
of the Company for £2 million nominal of the CULS, as described below. In
addition, the Company announced that, conditional upon Admission, it intends to
raise £6.5 million (before expenses) by means of the Subscription and the
Placing and that it is proposed that, subject to Admission and the CULS
Resolution being passed by CULS Holders at the CULS Meeting, the rights of the
CULS Holders be compromised and the liabilities and obligations of the Company
be released in respect of the remaining £2 million nominal of CULS (which will
not have been redeemed by the Company as part of the Disposal) in consideration
for the issue to such CULS Holders of an aggregate of 4,444,444 Ordinary
Shares.

The Concert Party has conditionally agreed to subscribe for the Subscription
Shares. The Concert Party comprises a group of five individuals, certain of
whom have extensive experience in the computer software industry. More
information on the Concert Party is set in the circular to Shareholders which
has been posted the Shareholders today. If Shareholders approve the GM
Resolution numbered 1 at the GM and the Subscription Agreement becomes
unconditional in all respects, the Concert Party will together hold 56.31 per
cent. of the Enlarged Issued Ordinary Share Capital (assuming that none of the
Placees default on their obligations pursuant to their placing letters) and
will have a maximum potential interest in shares of 58.14 per cent. Since this
would exceed 30 per cent. of the Enlarged Issued Ordinary Share Capital, the
Concert Party would, in the absence of a waiver from the provisions of Rule 9
of the Code being granted by the Panel, be obliged to make a general offer for
the Company. The Panel has agreed, subject to the GM Resolution numbered 1
being passed on a poll by Independent Shareholders at the GM, to waive this
obligation.

Background to the Proposals

As set out in the chairman's statement which accompanied the financial results
for the year ended 31 December 2009, it has been the Board's strategy since
2007 to reposition the Company for future profit growth. There has been a large
reduction in central overheads and in overall costs since then, which has saved
the Company approximately £2 million over the period. As a result the Company
made operating profits in 2008 and 2009. The management has worked successfully
to expand the Company's client base, focus on a return to profitability and
maintain its share of key markets. Most notably, the Business Systems division
has continued to win new business in City Academies and latterly the Financial
Markets division has won several large orders for its Blue Curve research
product. In addition, recurring revenues of the Company have grown to cover
over 70 per cent. of the Company's operating costs.

The above cost savings and increasing new business underpins operational cash
needs of the business but the Board believes that the Company requires
additional investment in order to maintain its competitive position and to
achieve substantial growth. The Company has to date been unable to identify a
source of additional funds and the Board believes that this is, in large part,
due to the £4 million of CULS making the Company appear unattractive to new
equity or debt investors, because of the dilution which would arise on
conversion or the perceived lack of sufficient funds to permit redemption. The
Company has, therefore, been looking for ways to eliminate this debt and the
Proposals allow the Company to realise value from the sale of the Financial
Markets division and at the same time attract an injection of further capital
which will, together with the CULS Compromise, facilitate the elimination of
the CULS. The monies raised pursuant to the Subscription and the Placing will
also allow the Board to focus on expanding the business through a combination
of acquisitions and organic growth in the software sector and, specifically,
the network security market.

The Concert Party, through its representatives, intends to invest in and expand
the Business Systems division in the short term but will also look to develop a
network security solutions business alongside it. The New Board supports this
strategy.

The Concert Party identified Corero as an ideal vehicle through which to
implement its strategy, as its members believe that the Company's management
and Shareholders have a strong understanding of the technology and software
sector and the benefits which could accrue from investment and suitable
acquisitions.

Principal terms of the Disposal

Under the terms of the Business Transfer Agreement, Corero Systems, a
subsidiary of the Company has agreed to dispose of the business and assets of
the Financial Markets division to Brokerhorse, in consideration for the
assumption by Rivington of the liability of the Company to £2 million nominal
of the CULS. In the year ended 31 December 2009, as extracted from the audited
financial statements of that date, the Financial Markets division made £350,000
of trading profit (2008: £10,000) and £150,000 profit before tax (2008: £
706,000 loss). As at that date, the Financial Markets division had gross assets
of £2,292,000 (2008: £2,482,000) and unaudited net assets of £2,000,000 (2008:
£1,972,000).

The Disposal will be achieved by the Company making an offer (set out below) to
the holders of the CULS to redeem £2 million nominal of the CULS in
consideration for Rivington agreeing to issue to the CULS Holders up to £2
million new Rivington 8% loan stock and £127,781 nominal of non-interest
bearing loan stock. The interest which accrues on the CULS which are the
subject of the CULS Offer between 1 July 2010 and the date of the completion of
the Disposal (both dates inclusive) and which would have otherwise been payable
on 31 December 2010 will be paid to CULS Holders within 14 days after
completion of the Disposal. The obligations of Brokerhorse in respect of the
Rivington Stock have been guaranteed by its parent company, Rivington Street
Holdings plc.

To the extent that any CULS Holder does not accept the CULS Offer, the
Rivington Stock which would otherwise have been issued to such CULS Holder will
be issued to the Company. This will enable the Company to meet its income
obligations to the CULS Holders who will continue to hold CULS under the CULS
Instrument and, following redemption of the Rivington Stock, to meet its
capital repayment obligations.

The Business Transfer Agreement is conditional, inter alia, upon the passing of
the GM Resolution numbered 2 in the notice of General Meeting.

Management arrangements

Mark Robertson will be receiving a bonus of £10,000 from Corero Systems upon
the successful completion of the Disposal. In addition, Mr Robertson will be
retained as a consultant to the Company for a period of two months to manage
the smooth transition of the business. Mr Robertson will be receiving a fee of
£20,000 (excluding VAT) for his services. Due to the significant nature of
these arrangements with Mark Robertson, Independent Shareholders are being
asked to approve these agreements, on a poll, in Resolution 3 in the notice of
GM.

Mark Robertson has indicated that he intends to dispose of his entire
shareholding in the Company, amounting to 153,049 Ordinary Shares, equivalent
to 10.08 per cent. of the Existing Ordinary Shares (and 0.48 per cent. of the
Enlarged Issued Ordinary Share Capital), potentially before the GM.

Any such disposal would be announced to the market in accordance with AIM Rule
17, without delay.

Proposals regarding the CULS

(a) CULS Offer

In respect of each holding of Convertible Unsecured Loan Stock held on the CULS
Offer Record Date, the Company is offering to redeem, pursuant to the CULS
Offer, one half of the principal amount comprising such holding on the basis
of:

£1 nominal of 8% Rivington Stock and £0.0638905 Zero Coupon Rivington Stock for
every £1 nominal of CULS

to the holders of such CULS and so in proportion for any other nominal amount
of CULS held. In respect of each holding of CULS to which the CULS Offer
relates, the CULS Offer must be accepted in whole, not in part. The Zero Coupon
Loan Stock has been calculated on the basis of, and is intended to replicate
payment of, the deferred interest which has accrued, and will continue to
accrue, on the CULS the subject of the CULS Offer between 1 January 2009 and
the date of the General Meeting. In addition, the interest accruing on the
CULS, the subject of the CULS Offer, in respect of the period from 1 July 2010
to the date of completion of the Disposal (both dates inclusive) and which
would have otherwise been payable on 31 December 2010, shall be paid in cash by
the Company to such CULS Holders within 14 days after completion of the
Disposal. Entitlements to Zero Coupon Rivington Stock shall be rounded down to
the nearest £1.

Provided that the date of the Disposal occurs within 14 days of the date of the
General Meeting, each holder of CULS that accepts the CULS Offer irrevocably
agrees as a term of the CULS Offer to waive their entitlement to any deferred
interest which accrues between the date of the General Meeting and the actual
date of the Disposal.

The CULS Offer is conditional on approval of the CULS Resolution and completion
of the Disposal. Any CULS Holders who do not accept the CULS Offer will remain
holding CULS. On Admission, the listing of the CULS on AIM will be cancelled.
If Admission does not occur the CULS will remain listed on AIM.

(b) CULS Compromise

In respect of the balance of each holding of Convertible Unsecured Loan Stock
held on the CULS Offer Record Date, it is proposed that the rights of the CULS
Holders shall be compromised and the obligations and liabilities of Corero 
shall be released pursuant to the CULS Compromise in consideration for:

the issue of one new Ordinary Share for every £0.45 nominal of CULS

to the holders of such CULS and so in proportion for any other nominal amount
of CULS then held. In addition, all deferred interest which has accrued up to
Admission and all interest (whether part deferred or otherwise) accruing on the
CULS in respect of the period from 1 July 2010 to Admission (both dates
inclusive) shall be paid in cash by the Company to such CULS Holders within 14
days after Admission.

Holders of CULS shall not be entitled to whole shares representing fractions
and instead whole shares representing fractions shall be allotted to finnCap
Limited who shall sell them and pay the net proceeds of sale to the Company.
Such proceeds shall be distributed among the holders entitled thereto in
proportion to their respective entitlements unless such proceeds amount to less
than £2 in respect of any one holding in which case they will not be so
distributed but will be retained for the benefit of the Company.

The CULS Compromise is conditional upon, amongst other things, Admission and
the passing of the CULS Resolution. Upon the resolution relating to the CULS
Compromise at the CULS Meeting becoming effective, the CULS Compromise will be
binding on all CULS Holders. However the CULS Compromise will not apply to any
CULS in respect of which the CULS Offer is made and any person who does not
accept the CULS Offer will remain holding CULS in accordance with the terms of
the CULS instrument and, on Admission, such CULS will not be listed.

(c) Irrevocable undertakings

Certain CULS Holders have given irrevocable undertakings to accept the CULS
Offer and to vote in favour of the CULS Compromise at the CULS Meeting in
respect of, in aggregate, £3,667,632 nominal of the CULS, representing
approximately 91.7 per cent. of the CULS which are the subject of the CULS
Offer and approximately 91.7 per cent. of the voting rights exercisable at the
CULS Meeting to approve, inter alia, the CULS Compromise. The CULS Holders who
have given the irrevocable undertakings have also entered into orderly market
arrangements with the Company and finnCap Limited whereby, for a period of 12
months, they have each agreed only to dispose of the Ordinary Shares which they
receive as a result of the CULS Compromise through finnCap Limited.

Settlement of the consideration under the CULS Offer

Loan stock certificates in respect of the 8% Rivington Stock and the Zero
Coupon Rivington Stock will be despatched within 14 days after the completion
of the Disposal.

The Placing

Under the terms of the Placing Agreement, finnCap Limited has conditionally
placed, as placing agent to the Company, up to 8,000,000 Ordinary Shares
(representing 25.03 per cent of the Enlarged Issued Ordinary Share Capital) at
the Placing Price to raise up to £2 million (gross) for the benefit of the
Company.

The Placing is conditional, inter alia, upon Admission taking place by 8.00a.m.
on 9 August 2010 (or such later date, being not later than 31 August 2010, as
the Company and finnCap Limited may agree).

The Placing Agreement contains provisions entitling finnCap Limited to
terminate the Placing Agreement at any time prior to Admission in certain
circumstances. If this right is exercised, the Placing will lapse.

The Placing Shares, when issued and fully paid, will rank equally in all
respects with the Existing Ordinary Shares, including the right to receive all
dividends and other distributions declared, made or paid after Admission.

It is expected that Admission will become effective and that dealings in the
Placing Shares will commence on 9 August 2010.

The Placing is also conditional upon the passing of the GM Resolutions numbered
1 to 7 in the notice of General Meeting including the passing of an ordinary
resolution (GM Resolution number 1) to approve the Rule 9 Waiver. Accordingly,
the Company has convened the General Meeting.

The Subscription

Under the terms of the Subscription Agreement, the Subscribers have
conditionally agreed to subscribe for 18,000,000 Ordinary Shares (representing
56.31 per cent of the Enlarged Issued Ordinary Share Capital) at the Placing
Price, raising £4.5 million before expenses for the benefit of the Company.

The Subscription is conditional, inter alia, upon Admission of the Subscription
Shares to trading on AIM and completion of the Disposal.

The Subscription Shares, when issued and fully paid, will rank equally in all
respects with the Existing Ordinary Shares, including the right to receive all
dividends and other distributions declared, made or paid after the Admission.

It is expected that Admission will become effective and that dealings in the
Subscription Shares will commence on 9 August 2010.

The Subscription is also conditional upon the passing of the GM Resolutions
numbered 1 to 7 in the notice of General Meeting, including the passing of an
ordinary resolution on a poll (GM Resolution numbered 1) to approve the Rule 9
Waiver.

Following Admission, the Company will have 31,963,434 Ordinary Shares in issue
(assuming that none of the Placees default on their obligations pursuant to
their placing letters).

Use of the proceeds

The Directors intend to use the net proceeds of the Placing and Subscription
(amounting to an aggregate of approximately (£6.5 million (gross)) primarily to
fund organic growth and working capital to execute the Company's strategy.

Proposed Directors and management

Conditional on Admission and on the passing of GM Resolution numbered 4 and 5
(as applicable), Jens Montanana will be appointed as a non-executive director
of the Company and Andrew Miller will be appointed as an executive director
responsible for finance, operations and M&A. Further information on Jens
Montanana and Andrew Miller is set out below.

Jens Peter Montanana (proposed non-executive director), aged 49, is the founder
and CEO of Datatec Limited, established in 1986. Between 1989 and 1993 Jens
served as managing director and vice-president of US Robotics (UK) Limited, a
wholly owned subsidiary of US Robotics Inc which was acquired by 3Com. In 1993
he co-founded US start up Xedia Corporation in Boston, an early pioneer of
network switching and one of the market leaders in IP bandwidth management,
which was subsequently sold to Lucent Corporation. In 1994 Jens became CEO of
Datatec Limited. Datatec Limited listed on the Johannesburg Stock Exchange in
1994 and on AIM in 2006. Jens has previously served on the boards and
sub-committees of various public companies.

Andrew Douglas Miller (proposed executive director responsible for finance,
operations and M&A), aged 46, was with the Datatec Limited group in a number of
roles between 2000 and 2009 including the Logicalis Group Limited ("Logicalis")
Operations Director and Corporate Finance and Strategy Director. Andrew led the
Logicalis acquisition strategy, acquiring and integrating 12 companies in the
US, UK, Europe and South America. Prior to this, Andrew gained considerable
corporate finance experience in London with Standard Bank, West Deutsche
Landesbank and Coopers & Lybrand. Andrew trained and qualified as a chartered
accountant and has a bachelor's degree in commerce from the University of
Natal, South Africa.

A further announcement providing the details required in accordance with
Schedule 2 (g) of the AIM Rules will be made following the Proposed Directors'
appointments to the Board after Admission.

In addition, conditional on Admission, Andre Stewart and Stephen Turner will
join the senior management team of the Company as vice president for sales and
vice president of technology solutions and services, respectively. Further
information on Andre Stewart and Stephen Turner is set out below.

Andre Luiz Alcantara Stewart (proposed vice president of sales), aged 40, has
over 10 years' experience in the network security market, most recently at
Fortinet, Inc. ("Fortinet") as VP Worldwide Sales and initially as VP EMEA
sales and managing director of European operations. Before joining Fortinet,
Andre was a Regional Director for Netscreen Technologies, Inc which was
subsequently acquired by Juniper Networks, Inc. Prior to that Andre was a
partner with Agora M&A focused on cross border M&A in the data communication
market, and prior to that spent two years with European IT focused Executive
Search firm, INS Group Ltd. Andre has a bachelor degree in political sciences
and languages from Kingston University, England.

Stephen Derek Allan Turner (proposed vice president of technology solutions and
services), aged 49, has over 20 years' experience in the IT networking and
security market. From 2006 to 2008, Stephen was with Fortinet in the US,
initially shaping the high-end appliance strategy, and subsequently as VP
Customer Services and Support worldwide. Between 2002 and 2005 Stephen was
founder and CEO of a wireless start-up company, Filfree Networks sarl, which
developed and commercialised a patented mesh networking system. Prior to this
Stephen ran a successful networking and security consultancy company for four
years. Stephen's technology background was originally founded over a six year
period as a technical support consultant within the European Area Field Support
Group of Digital Equipment Corporation in France, and subsequently between 1993
and 1995 as a customer advocacy consultant with Cisco Systems in Belgium.
Stephen has a bachelor degree in science (with Honours) - mechanical
engineering from Portsmouth University.

Future strategy and prospects

The Company will continue to manage and expand the successful Business Systems
division, which will continue to focus on the education sector where it has a
strong market position. In addition, the Company intends, following completion
of the Proposals, to enhance its existing business by embarking upon an
acquisition strategy in the network security solutions market. The Proposed
Directors believe that the Company presents an ideal opportunity to implement
this acquisition strategy because the management and shareholders of Corero
understand the technology and software sector and the benefits which could
accrue from investment and suitable acquisitions.

The New Board intends to develop the Company through organic growth and
strategic acquisitions in the network security market which, it believes,
offers a compelling commercial opportunity. The New Board believes that the
sector should continue to grow as security threats proliferate and the market
demand for evolved security products increases. The intention is for the
Company to move towards becoming a network security solutions vendor focused on
delivering high growth solutions and related services, to mid-market and larger
customers as well as telecommunications service providers through international
channels.

The new management team is an experienced senior executive management team with
extensive technology, sales, marketing, finance, acquisition, business
integration and operations experience.

The network security market

In 2008, the worldwide network security market was a US$7.2 billion market
(source: IDC). The European, Middle Eastern and African network security market
is forecast to have the strongest growth in the period 2008 to 2013 of
approximately 10.8 per cent. with revenues forecast to be approximately US$3.8
billion in 2013 (source: IDC).

Network security is a resilient area of IT spend and is often considered by
organisations to be non-discretionary. There are a number of reasons for this:

  * the rapid growth of the Internet has resulted in considerable growth of
    cyber crime, together with an increase in the threat of insider fraud and
    data theft. Security is a critical component of an organisation's IT
    infrastructure and the New Board believes can be considered
    non-discretionary, because of data theft issues and compliance
    requirements.
   
  * the security market is not at the point where existing solutions can
    protect against emerging or as yet unknown threats - the evolution of new
    threats demands continued security technological advances.
   
  * the security market is a constantly changing and evolving industry. There
    are several business drivers and IT trends which are forcing changes in
    security practices and related technology adoption:
   
  * the network perimeter, the boundary between private networks and the public
    domain, is rapidly dissolving as initiatives around external access to
    Internet connected corporate networks, cloud computing domains, consumer
    and social networking and software-as-a-service, are now making the notion
    of a secure network perimeter (the cornerstone of past security efforts)
    more irrelevant. In addition, organisations are increasingly making
    applications on their networks accessible to partners and customers.
   
  * virtualisation, a simulated computer environment, is disrupting traditional
    security models and causing a significant rethink of network security for
    many organisations.
   
  * the evolving Web is the new frontier for attacks - traditional Web
    protection practices such as URL filtering and antivirus protection at the
    gateway have failed to keep up with today's security issues. The
    exploitation of vulnerabilities on legitimate Web sites, phishing attacks,
    as well as Web 2.0 and social networking-based attacks are all forcing
    organisations to adopt real-time Web content analysis.
   
  * as a direct result of increasing cybercrime, new legislation is creating an
    always-changing compliance requirement for information security.
    Organisations in industry sectors such as healthcare, financial services
    and government, are required to comply with regulations such as Health
    Insurance Portability and Accountability Act (HIPAA), Sarbanes Oxley Act
    (SOX), and those from the Payment Card Industry (PCI).
   
The network security market is highly fragmented with no single company
offering a solutions portfolio that spans the customer requirements spectrum.
The top three network security vendors, Cisco Systems Inc, Check Point Software
Technologies Limited and Juniper Networks Inc. represent 43 per cent. of the
market. The next 55 companies represent 35 per cent. of the market (with the
remaining 22 per cent. of the market represented by companies with revenues of
less than US$3 million per annum) (source: IDC). The New Board is of the view
that the larger security vendors generally lag behind the market in terms of
innovation, whilst smaller innovative companies typically remain too small to
compete effectively.

Strategy

Many smaller, albeit innovative, network security technology companies,
especially in Europe, have stagnated and find it difficult to grow revenues due
to a lack of scale, operational expertise and market credibility. These smaller
companies institutional, venture capital and management shareholders could be
positively disposed to a broader strategy and potential exit. The New Board is
of the view that there is a significant opportunity to leverage the technology
of these smaller innovative network security technology companies and bring
selected products to market by:

  * executing a buy and build strategy;
   
  * providing expertise and experience in sales, marketing, services and
    finance; and
   
  * building critical mass and market credibility.
   
The New Board have identified a number of appropriate potential acquisition
opportunities for the Company and it is envisaged that the Company will make
multiple acquisitions, although none have progressed beyond the stage of
preliminary assessment at present. It is intended that the acquisitions will
principally be funded from the issue of further equity.

Subsequent to the acquisitions, the primary focus will be to increase the
revenues and market share of the acquired entities by developing and providing
to them additional commercial activities in sales and marketing, technical
support services, international business partners and distribution channels and
leveraging the management team's knowledge and contacts within the security
market industry. It is intended that sales, marketing and support teams will be
assembled to augment the commercial capabilities of the acquired companies,
with the initial geographic focus being Europe and the Middle East and then the
Americas and Asia Pacific.

In addition, the Company will plan to:

  * develop a strong recurring revenue offering, including both customer
    support services and security update services, with the objective of these
    services representing a significant portion (approximately 40 per cent.) of
    the overall revenues;
   
  * derive benefits from increased efficiencies and economies of scale as
    multiple companies and additional business streams are aggregated; and
   
  * implement appropriate management controls and disciplines supporting
    detailed forecasting, management reporting and internal and external metric
    benchmarking.
   
Circular, General Meeting and CULS Meeting

A circular to Shareholders, the notice of General Meeting and the notice of
CULS Meeting will be posted to Shareholders and will be available from the
Company's website www.corero.com later today. The General Meeting and the CULS
Meeting have been convened for 10.00 a.m. and 10.05 a.m. (or at such later time
as the General Meeting convened for 10.00 a.m. has been concluded or been
adjourned), respectively, on 6 August 2010 at the offices of Merchant
Securities Limited, 51-55 Gresham Street, London EC2V 7HQ.

                                 Definitions                                  
                                                                              
The following definitions apply throughout this announcement unless the       
context requires otherwise:                                                   
                                                                              
"8% Rivington Stock"   the £2,000,000 nominal of 8% unsecured redeemable loan 
                       stock of Rivington                                     
                                                                              
"Admission"            the admission of the New Shares to trading on AIM      
                       becoming effective in accordance with the AIM Rules    
                                                                              
"AIM"                  the AIM Market of the London Stock Exchange            
                                                                              
"AIM Rules"            the rules published by the London Stock Exchange       
                       relating to AIM, as amended from time to time          
                                                                              
"Brokerhorse" or "the  Brokerhorse Limited, a subsidiary of RSH               
Purchaser"                                                                    
                                                                              
"Business Transfer     the conditional agreement dated 13 July 2010 between   
Agreement"             (1) Corero Systems, (2) the Purchaser, (3) Rivington   
                       and (4) RSH relating to the Disposal                   
                                                                              
"Code"                 the City Code on Takeovers and Mergers                 
                                                                              
"Company" or "Corero"  Corero plc                                             
                                                                              
"Concert Party"        Jens Montanana, Andrew Miller, Andre Stewart, Stephen  
                       Turner and Ezio Simonelli                              
                                                                              
"Corero Systems"       Corero Systems Limited                                 
                                                                              
"CREST"                the system for paperless settlement of trades and the  
                       holding of uncertificated shares administered through  
                       Euroclear                                              
                                                                              
"CREST Manual"         the compendium of documents entitled CREST Manual      
                       issued by Euroclear from time to time and comprising   
                       the CREST Reference Manual, the CREST Central          
                       Counterparty Service Manual, the CREST International   
                       Manual, CREST Rules, CCSS Operations Manual and the    
                       CREST Glossary of Terms                                
                                                                              
"CULS Compromise"      the proposed compromise of the rights of CULS Holders  
                       and the release of the obligations and liabilities of  
                       the Company in respect of an aggregate principal amount
                       of £2,000,000 CULS                                     
                                                                              
"CULS Compromise       the 4,444,444 Ordinary Shares to be issued pursuant to 
Shares"                the CULS Compromise                                    
                                                                              
"CULS" or "Convertible the £4,000,000 nominal of 8% (Part Deferred)           
Unsecured Loan Stock"  convertible unsecured redeemable loan stock 2015       
                                                                              
"CULS Holders"         the persons whose names are for the time being entered 
                       as holders of the CULS in the register of CULS Holders 
                                                                              
"CULS Instrument"      the instrument dated 8 September 2000 constituting the 
                       CULS (as amended)                                      
                                                                              
"CULS Meeting"         the meeting of holders of CULS convened for 10.05 a.m. 
                       on 6 August 2010 (or such later time as the General    
                       Meeting convened for same day shall have concluded or  
                       been adjourned)                                        
                                                                              
"CULS Offer"           the offer to holders of the CULS offering to redeem £2 
                       million nominal of CULS and to repay £127,781 of       
                       deferred interest in consideration of the issue to such
                       holders of Rivington Stock                             
                                                                              
"CULS Offer Record     19 July 2010                                           
Date"                                                                         
                                                                              
"CULS Resolution"      the resolution set out in the notice of meeting of the 
                       holders of CULS                                        
                                                                              
"Directors" or "Board" the directors of the Company                           
                                                                              
"Disposal"             the proposed disposal of the Financial Markets division
                       of the Company pursuant to the Business Transfer       
                       Agreement                                              
                                                                              
"Enlarged Issued       the issued ordinary share capital of the Company       
Ordinary Share         immediately following Admission (assuming that none of 
Capital"               the Placees default on their obligations pursuant to   
                       their placing letters)                                 
                                                                              
"Euroclear"            Euroclear UK & Ireland Limited, the operator of CREST  
                                                                              
"Existing Ordinary     the 1,518,990 Ordinary Shares in issue at today's date 
Shares"                                                                       
                                                                              
"Form of Acceptance"   the form of acceptance for use by CULS Holders who hold
                       their CULS in certificated form in connection with the 
                       CULS Offer                                             
                                                                              
"Form(s) of Proxy"     the form(s) of proxy accompanying the Shareholder      
                       circular for use in connection with the GM and/or the  
                       CULS Meeting, as appropriate                           
                                                                              
"GM" or "General       the general meeting of the Company convened for 10.00  
Meeting"               a.m. on 6 August 2010                                  
                                                                              
"GM Resolutions"       the resolutions set out in the notice of the General   
                       Meeting                                                
                                                                              
"Group"                the Company together with its subsidiary undertakings  
                                                                              
"Independent           the Shareholders other than Mark Robertson             
Shareholders"                                                                 
                                                                              
"London Stock          London Stock Exchange plc                              
Exchange"                                                                     
                                                                              
"New Board"            Peter Waller, Bernard Snowe, Richard Last, Jens        
                       Montanana and Andrew Miller                            
                                                                              
"New Shares"           together, the CULS Compromise Shares, the Placing      
                       Shares and the Subscription Shares                     
                                                                              
"Ordinary Shares"      the ordinary shares of 1p each in the capital of the   
                       Company                                                
                                                                              
"Panel"                the Panel on Takeovers and Mergers                     
                                                                              
"Placees"              the subscribers for Placing Shares pursuant to the     
                       Placing                                                
                                                                              
"Placing"              the conditional placing of the Placing Shares at the   
                       Placing Price pursuant to the Placing Agreement        
                                                                              
"Placing Agreement"    the conditional agreement dated 13 July 2010 between   
                       the Company, Jens Montanana and finnCap Limited        
                                                                              
"Placing Price"        25p per Placing Share                                  
                                                                              
"Placing Shares"       up to 8,000,000 Ordinary Shares which have been        
                       conditionally placed by finnCap Limited pursuant to the
                       Placing                                                
                                                                              
"Proposals"            the Disposal, Subscription, Placing, the Rule 9 Waiver,
                       the CULS Compromise and Admission                      
                                                                              
"Proposed Directors"   Jens Montanana and Andrew Miller                       
                                                                              
"Rivington"            Rivington Street Ventures Limited, a subsidiary of RSH 
                                                                              
"Rivington Stock"      the 8% Rivington Stock and the Zero Coupon Rivington   
                       Stock                                                  
                                                                              
"RSH"                  Rivington Street Holdings plc                          
                                                                              
"Rule 9 Waiver"        the agreement by the Panel to waive the obligation on  
                       the Concert Party to make a general offer to all       
                       Shareholders pursuant to Rule 9 of the Code subject to 
                       approval, by way of a poll vote, of the GM Resolution  
                       numbered 1 in the notice of General Meeting            
                                                                              
"Shareholders"         holders of Existing Ordinary Shares                    
                                                                              
"Subscription"         the conditional subscription for the Subscription      
                       Shares pursuant to the Subscription Agreement          
                                                                              
"Subscription          the conditional agreement dated 13 July 2010 between   
Agreement"             (1) certain members of the Concert Party (and/or       
                       entities which are wholly owned by members of the      
                       Concert Party) and (2) the Company relating to the     
                       Subscription                                           
                                                                              
"Subscription Shares"  the 18,000,000 Ordinary Shares to be issued pursuant to
                       the Subscription at the Placing Price                  
                                                                              
"TTE instruction"      transfer to escrow instruction (as defined in the CREST
                       Manual)                                                
                                                                              
"Zero Coupon Rivington the £127,781 nominal of zero coupon unsecured          
Stock"                 redeemable loan stock of Rivington                     

                         Expected timetable of events                         
                                                                              
                                                                          2010
                                                                              
Record date for the CULS Offer                                         19 July
                                                                              
Latest time for receipt of GM Forms of Proxy                  10.00 a.m. on 14
                                                                        August
                                                                              
Latest time for receipt of CULS Forms of Proxy                10.05 a.m. on 14
                                                                        August
                                                                              
Latest time and date for receipt of Forms of Acceptances and    1.00 p.m. on 5
TTE instructions under the CULS Offer                                   August
                                                                              
Expected time and date of announcement of results of CULS       7.00 a.m. on 6
Offer                                                                   August
                                                                              
General Meeting                                                10.00 a.m. on 6
                                                                        August
                                                                              
CULS Meeting                                                   10.05 a.m. on 6
                                                                        August
                                                                              
Completion of the Disposal                                            9 August
                                                                              
Admission effective and dealings expected to commence in the          9 August
New Shares                                                                    
                                                                              
CREST accounts credited with New Shares                              16 August
                                                                              
Share certificates in respect of the New Shares expected to          16 August
be despatched by no later than                                                
                                                                              

                           Share capital statistics                           
                                                                              
Placing Price                                                         25 pence
                                                                              
Number of Placing Shares being issued by the Company*                8,000,000
                                                                              
Number of Subscription Shares being issued by the Company           18,000,000
                                                                              
Number of CULS Compromise Shares being issued by the Company         4,444,444
                                                                              
Number of Ordinary Shares in issue immediately following            31,963,434
Admission*                                                                    
                                                                              
Percentage of Enlarged Issued Ordinary Share Capital           81.34 per cent.
represented by the Placing Shares and the Subscription Shares                 
*                                                                             
                                                                              
Amount, after expenses, being raised under the Placing and          £6,158,000
Subscription*                                                                 
                                                                              
Market capitalisation of the Company at the Placing Price           £7,990,858
immediately following Admission*                                              
                                                                              

*Assuming none of the Placees default on their obligations pursuant to their
placing letters