NOTIFICATION OF MAJOR INTEREST IN SHARES

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

X

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

Aberforth Partners LLP

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

1. Aberforth Smaller Companies Trust plc - 7,516,000

2. Aberforth UK Small Companies Fund - 2,487,500

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

8 September 2010

6. Date on which issuer notified:

9 September 2010

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 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 x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB0009739649

18,336,400

18,336,400

10,003,500

N/A

10,003,500

N/A

4.91

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period xiv

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

Total (A+B+C)

Number of voting rights

Percentage of voting rights

10,003,500

4.91%

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

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:

14. Contact name:

Pauline Robson, Aberforth Partners LLP

15. Contact telephone number:

0131 220 0733

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in share

A: Identity of the persons or legal entity subject to the notification obligation

Full name

(including legal form of legal entities)

Aberforth Partners LLP

Contact address

(registered office for legal entities)

14 Melville Road, Edinburgh, EH3 7NS

Phone number & email

Pauline Robson - 0131 220 0733

Other useful information

(at least legal representative for legal persons)

B: Identity of the notifier, if applicable

Full name

Source BioScience plc

Contact address

1 Orchard Place, Nottingham, NG8 6PX

Phone number & email

0115 973 9010

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information