Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Microgen plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

X

Other (please specify):

3. Full name of person(s) subject to the notification obligation:

Aberforth Partners LLP

4. Full name of shareholder(s) (if different from 3.):

Shareholder Shares

1. Aberforth Smaller Companies Trust plc 8,756,026

2. Aberforth UK Small Companies Fund 2,916,751

3. Aberforth Geared Capital & Income Trust plc 1,902,400

4. Aberforth Geared Income Trust plc 684,200

All shares are registered in the name of Nortrust Nominees Ltd A/c Aberforth

5. Date of the transaction and date on which the threshold is crossed or reached:

07/09/2010

6. Date on which issuer notified:

08/09/2010

7. Threshold(s) that is/are crossed or reached:

17%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

Ord 5p Shares

14,393,977

14,393,977

14,259,377

N/A

14,259,377

N/A

17.73

GB0005869531

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

N/A

N/A

N/A

N/A

N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

N/A

N/A

N/A

N/A

N/A

Nominal

Delta

N/A

N/A

Total (A+B+C)

Number of voting rights

Percentage of voting rights

14,259,377

17.73

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

Held by Aberforth Partners LLP

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

%age held changed as a result of TVR announced 31 Aug 2010

14. Contact name:

Pauline Robson, Aberforth Partners LLP

15. Contact telephone number:

0131 220 0733