Holding(s) in Company

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

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

Other (please specify):

A client changed their mandate from non-discretionary to discretionary thereby increasing the discretionary holding over the 5% reporting threshold.

x

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

HARGREAVE HALE LIMITED

4. Full name of shareholder(s)

(if different from 3.): iv

DISCRETIONARY CLIENTS

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

05 APRIL 2013

6. Date on which issuer notified:

08 APRIL 2013

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

reached: vi, vii

5%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Indirect

Direct xi

Indirect xii

Direct

Indirect

GB0005869531

3,841,550

3,841,550

4,191,550

4,191,550

5.0790%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/ConversionPeriod xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate xvii

Exercise/Conversionperiod xviii

Number of votingrights instrumentrefers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 4,191,550

5.0790%

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

3,350,000 of these shares are held for unit trusts operated by Marlborough Fund Managers Ltd for whom Hargreave Hale Ltd manages the investments on a discretionary basis. The remaining shares are held for other Discretionary clients.

Proxy Voting:

10. Name of the proxy holder:

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

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

13. Additional information:

14. Contact name:

 David Clueit

15. Contact telephone number:

 01253 754739