Holding(s) in Company

24 April 2007

                                  Corero Plc                                   

                          ("Corero" or the "Company")                          

                              Holding in Company                               

Further to the announcement made on 3 April 2007, the Company announces that it
has been notified that, following the issue of 1,358,525 ordinary shares
arising from the earnout of Blue Curve, equivalent to 2.98 per cent of the
total voting rights of Corero, TriVest VCT now holds 2,946,707 ordinary shares,
equivalent to 6.47 per cent. of the total voting rights of the Company.

ENQUIRIES:

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