Notification of Major Interest in Shares

25th Jul 2011 17:46

For filings with the FSA include the annex For filings with issuer exclude the annex

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuer Source Bioscience of existing shares to which voting rights are

PLC attached:ii

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

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 21st July 2011 reached:v 6. Date on which issuer notified: 25th

July 2011

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

gone above 5%reached: vi, vii 8. Notified details:

A: Voting rights attached to shares viii, ix Class/type Situation previous Resulting situation after the triggering transaction of to the triggering shares transaction if possible Number Number Number Number of voting % of voting rights x using of of of shares rights the ISIN Shares Voting CODE Rights Direct Direct xi

Indirect xii Direct Indirect

GB0009739649 N/A N/A N/A N/A 10,715,000 N/A 5.26%

B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration Exercise/ Number of voting % of voting instrument date xiii Conversion Period xiv rights that may be rights acquired if the instrument is exercised/ converted. C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction Type of Exercise price Expiration Exercise/ Number of voting rights % of voting rights financial date xvii Conversion period instrument refers to xix, xx instrument xviii Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 10,715,000 5.26%

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

BlackRock Investment Management (UK) Limited - 10,715,000 (5.26%)

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: BlackRock International Threshold Reporting Team13. Additional information: 14. Contact name: Andrew Manchester

15. Contact telephone number: 020 7743 5773

Note: Annex should only be submitted to the FSA not the issuer Annex: Notification of major interests in sharesxxii

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

obligation Full name

(including legal form of legal entities) BlackRock, Inc.

Contact address 33 King William Street, London,

(registered office for legal entities) EC4R 9AS

Phone number & email 020 7743 5773;

[email protected]

Other useful information

(at least legal representative for legal persons) Andrew Manchester

B: Identity of the notifier, if applicable

Full name Contact address Phone number & email Other useful information

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

C: Additional information

For notes on how to complete form TR-1 please see the FSA website.

XLON

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Related Shares:

SBS.L