Issue of Equity

3 April 2007

                                  Corero Plc                                   

                          ("Corero" or the "Company")                          

                              Additional listing                               

The Company announces that, following the announcement of the final results for
the year ended 31 December 2007, the Company is required to issue 8,720,952
ordinary shares ("Ordinary Shares") in the capital of the Company ("the
Deferred Consideration Shares") to satisfy deferred consideration due to Blue
Curve Limited ("Blue Curve") under the acquisition agreement entered into at
the time of the acquisition of Blue Curve. Blue Curve was acquired in January
2006 at which time it was issued 5,606,060 Ordinary Shares as initial
consideration and the Deferred Consideration Shares have been issued in
accordance with, and subject to, earn-out provisions which have been achieved.

The Deferred Consideration Shares will rank pari passu with the existing issued
ordinary shares in the capital of the Company. Application will be made for the
Deferred Consideration Shares to be admitted to trading on the AIM Market. It
is expected that admission will become effective and that trading will commence
in the Deferred Consideration Shares on 11 April 2007. Following admission,
Corero will have 45,568,452 ordinary voting shares in issue.

ENQUIRIES:

Corero plc                                                                   
                                                                             
Jarlath McGee/Ian Selby                                     Tel:[phone]
                                                                             
John East & Partners Limited                                                 
                                                                             
Virginia Bull                                              Tel: [phone]
                                                                             
College Hill                                                                 
                                                                             
Matthew Smallwood/Jamie Ramsay                             Tel: [phone]