Rule 8.1- Trace Group PLC

Microgen PLC
05 June 2007


                                                                     FORM 8.1

          DEALINGS BY OFFERORS, OFFEREE COMPANIES OR THEIR ASSOCIATES
                  FOR THEMSELVES OR FOR DISCRETIONARY CLIENTS
                 (Rules 8.1(a) and (b)(i) of the Takeover Code)


1. KEY INFORMATION


Name of person dealing (Note 1)        MICROGEN PLC                                      

Company dealt in                       TRACE GROUP PLC 
                                     
Class of relevant security to which    ORDINARY 5 pence SHARES                              
the dealings being disclosed relate                                                     
(Note 2)                                                                                
                                                                                        
Date of dealing                        5 JUNE 2007                                          
                                                                                        

2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)


                                             Long                      Short           
                                         
                                   Number            (%)        Number       (%)                 
                                                                                       
(1) Relevant securities            3,430,000      24.07%                                    
                                                                                       
(2) Derivatives (other than                                                           
    options)                                                    

(3) Options and agreements to     

Total                               3,430,000     24.07%    


(b) Interests and short positions in relevant securities of the company, other
    than the class dealt in (Note 3)


Class of relevant security:                  Long                      Short          

                                    Number (%)                 Number        (%)

(1) Relevant securities 

(2) Derivatives (other than
    options)    

(3) Options and agreements to  
    purchase/sell   

Total  

(c) Rights to subscribe (Note 3)

Class of relevant security:        Details                                              

3. DEALINGS (Note 4)

(a) Purchases and sales

Purchase/sale                     Number of securities   Price per unit (Note 5)

PURCHASE                          3,430,000              152.0 pence    

(b) Derivatives transactions (other than options)

Product name,     Long/short      Number of securities     Price per unit 
e.g. CFD          (Note 6)       (Note 7)                  (Note 5)


(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying


Product     Writing,      Number of   Exercise   Type, e.g.  Expiry  Option  
name, e.g.  selling,      securities  price      American,   date    money paid/              
call        purchasing,   to which               European            received 
option      varying etc.  the option             etc.                per unit 
                          relates                                    (Note 5)
                          (Note 7)

(ii) Exercising


Product name, e.g.       Number of securities      Exercise price per unit Note 
call option                                        (Note 5)                           

d) Other dealings (including new securities) (Note 4)


Nature of transaction        Details              Price per unit (if applicable)
(Notre 8)                                         (Note 5)   

4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the person         
disclosing and any other person relating to the voting rights of any relevant 
securities under any option referred to on this form or relating to the voting 
rights or future acquisition or disposal of any relevant securities to which 
any derivative referred to on this form is referenced. If none, this should be
stated.                             

NONE                                                                           

Is a Supplemental Form 8 attached? (Note 9)       NO

Date of disclosure                                5 JUNE 2007   


Contact name                                      PHILIP WOOD         


Telephone number                                  01252 772 300         


Name of offeree/offeror with which associated     N/A           

Specify category and nature of associate status   N/A
(Note 10)   


Notes

The Notes on Form 8.1 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk



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