Acquisition(s)

Avacta Group Plc

Completion of Acquisition of Oxford Medical Diagnostics Limited

Avacta Group Plc ("Avacta" or the "Company"), announces that the conditional
acquisition of Oxford Medical Diagnostics Limited ("OMD") announced on 14
November 2007 has been completed.

Accordingly, application has been made for 21,954,035 ordinary shares of 0.1
pence each in the capital of Avacta ("Ordinary Shares") issued as the first
element of the consideration for the acquisition of OMD to be admitted to
trading on AIM. Dealings are expected to commence on 20 December 2007,
following which the Company's issued ordinary share capital will comprise
800,432,077 Ordinary Shares. The second element of the consideration,
comprising the issue of a further 21,954,035 Ordinary Shares, will take place
on the agreement of the completion balance sheet.

Prof Alastair Smith, Chief Executive, commented:

"The acquisition of OMD delivers on our long term objectives of providing high
value solutions in clinical diagnostics whilst also contributing a nearer term
revenue stream through industrial gas sensing applications. OMD's technology
and industry relationships are highly synergistic to Avacta and we hope to
capitalise on this across the Group.

"Indeed, based on our own discussions with clinicians, we believe that breath
diagnostics has the potential to create a step change in patient testing and
OMD has a strong intellectual property position in this area having been given
an exclusive licence to a patent granted in the US and with ongoing
applications in other geographies. It's a tremendously exciting opportunity"

                                                               14 December 2007

Enquiries:

Avacta Group plc                          Tel: [phone]                 
                                                                             
Alastair Smith, Chief Executive                                              
                                                                             
Nexus Financial Ltd                       Tel: [phone]                 
                                                                             
Nicholas Nelson/Kathy Boate               [e-mail]   
                                                                             
WH Ireland Limited                        Tel: [phone]                 
                                                                             
David Youngman/Robin Gwyn                                                    
                                                                             
BankOra Limited - Nominated Broker        Tel: [phone]                 
                                                                             
Henry Turcan/Michael Brennan