Notification of major interest in shares

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

Source BioScience plc

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

An acquisition or disposal of voting rights

Yes

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):

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

Mr Yeung Yu Loong

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

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

22/08/2013

6. Date on which issuer notified:

31/08/2013

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

5%

Class/type ofsharesif possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation afterthe triggeringtransaction

NumberofShares

NumberofVotingRights

Numberofshares

Numberofvotingrights

% of votingrights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB0009739649

9,360,888

9,360,888

12,276,564

12,276,564

5.77%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

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

% of votingrights

N/A

N/A

N/A

N/A

N/A

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 votingrights xix, xx

Nominal

Delta

N/A

N/A

N/A

N/A

N/A

N/A

N/A

Total (A+B+C)

Number of voting rights

Percentage of voting rights

12,276,564

5.77%

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

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:

14. Contact name:

Dr Nick Ash, Company Secretary

15. Contact telephone number:

+44 (0) 115 9739010