Holding(s) in Company

John Wood Group PLC ("Company") NOTIFICATION OF MAJOR INTEREST IN SHARES 1. Name of Issuer JOHN WOOD GROUP PLC 2. Reason for Notification DISPOSAL OF VOTING RIGHTS 3. Full name of person(s) subject to notification obligation BLACKROCK, INC 4. Full name of shareholder(s) (if different from 3 above) N/A 5. Date of the transaction and date on which the threshold is crossed or reached 12 JULY 2013 6. Date on which issuer notified 16 JULY 2013 7. Threshold(s) that is/are crossed or reached BELOW 14% 8. Notified details (A) Voting rights attached to shares Number of voting rights - Direct - N/A Number of voting rights - Indirect - 49,471,841- 13.26% (B) Financial Instruments N/A (C) Financial Instruments with similar economic effect to Qualifying FinancialInstruments Resulting situation after the triggering transaction Type of financial instrument - CFD Exercise Price - N/A Expiration date - N/A Exercise/conversion period - N/A Number of voting rights instrument refers to - 2,504,269 Percentage of voting rights - Nominal - 0.67% Delta - 0.67% Total A + B + C Number of voting rights - 51,976,110 Percentage of voting rights - 13.93% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable BLACKROCK INVESTMENT MANAGEMENT (UK) LIMITED - 51,976,110 (13.93%) 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 N/A 14. Contact name DUNCAN MURRAY 15. Contact telephone number 020 7743 3334 Notification authorised by: ROBBIE M B BROWN, COMPANY SECRETARY

17 JULY 2013