Notification re major interest in shares

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 Source BioScience plcissuer of existing shares to which voting

rights are attached: ii 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 Nomay result in the acquisition of shares already issued to which votingrights are attached

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

An event changing the breakdown of voting rights No Other (please Nospecify): 3. Full name of person(s) subject to Miton Group plcthe notification obligation: iii 4. Full name of shareholder(s) (if See section 9 belowdifferent from 3.):iv 5. Date of the transaction and date 1 March 2013on which the threshold is crossed orreached: v 6. Date on which issuer notified: 4 March 2013 7. Threshold(s) that is/are crossed Was 0.00%, Now 6.75%or reached: vi, vii 8. Notified details:A: Voting rights attached to shares viii, ix Class/type of Situation Resulting situation after shares previous the triggering to the triggering transaction transactionif possibleusing Number Number % of voting the ISIN CODE Number of Number of rights x of Voting of voting Shares Rights shares rights Direct Direct Indirect Direct Indirect xi xii ORD GBP0.2 0 0 13,816,376 n/a 13,816,376 n/a 6.75% GB0009739649 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 rights that may be rights xiv acquired if the instrument is exercised/ converted. Na/ n/a n/a n/a n/a

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

Resulting situation after the triggering transaction Type of Exercise Expiration Exercise/ Number of voting % of voting financial price date xvii Conversion rights instrument rights xix, xx instrument period refers to xviii Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 13,816,376 6.75%

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

Henderson Fledgling Trust HSBC Global Custody Nominees (UK) Ltd a/c 72475513,816,376

Proxy Voting: 10. Name of the proxy holder: n/a 11. Number of voting rights proxy n/aholder will cease to hold: 12. Date on which proxy holder will n/acease to hold voting rights: 13. Additional information: Miton Capital Partners Ltd and Miton Asset Management Ltd are both subsidiaries of Miton Group plc - appointment of Investment Manager 14. Contact name: Ian Borrows 15. Contact telephone number: 0151 906 2476