Holding(s) in Company

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 Oxford Instruments plcissuer of existing shares to which votingrights 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 whichmay result in the acquisition of shares already issued to which votingrights are attached An acquisition or disposal of instruments with similar economic effectto qualifying financial instruments An event changing the breakdown of voting rights Other (pleasespecify): 3. Full name of person(s) subject to the Legal & General Group Plc (L&G)notification obligation: iii 4. Full name of shareholder(s) (if n/adifferent from 3.):iv 5. Date of the transaction and date on 18 November 2013which the threshold is crossed or reached:v 6. Date on which issuer notified: 19 November 2013 7. Threshold(s) that is/are crossed or L&G (Below 3%)reached: vi, vii 8. Notified details:A: Voting rights attached to shares viii, ix Class/type of Situation Resulting situation aftershares previous the triggering to the triggering transaction transactionif possibleusing Number Number % of votingthe ISIN CODE Number of Number of rights x of Voting of voting Shares Rights shares rights Direct xi Indirect Direct Indirect xii GB0006650450 1,916,398 Below 3% Ordinary 5p (as at 18/04/2013) 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. 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 Below 3% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi Legal & General Group Plc (Direct and Indirect) (Group) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct andIndirect) Legal & General Investment Management Limited (Indirect) (LGIM) Legal & General Group Plc (Direct) (L&G) (Below 3% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD) Legal & General Insurance Holdings Limited (Direct) (LGIH) Legal & General Assurance (Pensions Management) Limited (PMC) Legal & General Assurance Society Limited (LGAS & LGPL) Legal & General Pensions Limited (Direct) (LGPL) 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: 14. Contact name: Susan Johnson-Brett 15. Contact telephone number: 01865 393 200