Operational Update

Lansdowne Oil & Gas plc
01 May 2008


                                                                      1 May 2008


                            Lansdowne Oil & Gas plc
                         ('Lansdowne' or the 'Company')


              Operational Update - commencement of seismic survey


Lansdowne Oil & Gas plc, the Dublin-based exploration company, is pleased to
announce that a 2D seismic acquisition programme has commenced over recently
awarded Licence 5/08, in the Celtic Sea, offshore Ireland.


Standard Exploration Licence 5/08 was awarded last month to Lansdowne's recently
acquired wholly-owned subsidiary Milesian Oil & Gas Limited ('Milesian').
Standard Exploration Licence 5/08 covers an area of 449 sq kms over parts of
blocks 47/25, 48/21, and 48/22. The blocks are located 30 kms from the
coastline, in water depths of approximately 100 metres.


The Norwegian based company, Wavefield Inseis ASA, is carrying out the survey on
behalf of Milesian/Lansdowne using the M/V Malene Ostervold, which sailed from
Cork on 29 April 2008 and commenced seismic acquisition at 15.00 Hours on 30
April 2008. The 2D seismic survey of approximately 485 kms will be acquired over
the Amergin and Eremon structures that have been mapped from existing seismic
data. Amergin has been independently verified as having best case potentially
recoverable prospective resources of 63 million barrels of oil equivalent
('MMBOE').


Standard Exploration Licence 5/08 is valid for a period of six years (in two
three year phases) during which Milesian is required to drill an exploration
well and to complete the acquisition of 300 kms of new seismic data within the
first three year phase. The ongoing acquisition of seismic data will fulfil the
latter obligation. Under the terms of the licence, on 31 March 2011 Milesian is
required to surrender 50 per cent. of the licence area.


Steve Boldy, Chief Executive of Lansdowne, commented:


'We are pleased that the seismic survey has commenced so quickly after the
licence award and look forward to working with Wavefield Inseis on this
programme, which we expect to better define the large structures we have
identified upon Licence 5/08.'


Enquiries:

Lansdowne Oil & Gas plc

Stephen Boldy, CEO                               Tel: [phone]

Emmet Brown, Business Development Director       Tel: [phone]

John East & Partners Limited

David Worlidge                                   Tel: [phone]


Notes to Editors:



Lansdowne Oil & Gas plc is an independent oil and gas exploration company listed
on the AIM market in London with its operations focused on the Irish offshore
North Celtic Sea basin. Its operating headquarters is in Dublin.


The Company was founded in December 2005 and admitted to AIM in April 2006
having acquired from Ramco Energy plc its portfolio of Irish exploration and
appraisal assets that flank the Kinsale Head gas field and its infrastructure.
The Company recently significantly expanded its North Celtic Sea portfolio
through the acquisition of Milesian Oil & Gas Limited in December 2007 with its
identified exploration prospects for Jurassic oil and gas.


Following the acquisition and interpretation of this new seismic further
consideration may become payable to the Milesian vendor shareholders.


An updated Independent Technical Report relating to Milesian's acreage will be
commissioned following the conclusion of the seismic programme. If that report
confirms best case potentially recoverable prospective resources of at least 63
MMBOE then a further 2,333,419 new shares in Lansdowne will be issued to the
Milesian vendor shareholders.


Additionally for each 1 MMBOE of best case potentially recoverable prospective
resources above 63 MMBOE, but capped at a total of 155 MMBOE a further 62,790
new Lansdowne shares will be issued to the Milesian vendor shareholders.
Therefore a maximum of 8,110,099 new Lansdowne shares may become issuable where
the best case potentially recoverable prospective resources reach 155 MMBOE.


Further information on Lansdowne is available at Lansdowne's website at

www.lansdowneoilandgas.com


                      This information is provided by RNS
            The company news service from the London Stock Exchange