WOOD GROUP (JOHN) PLC: 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

AMENDMENT TO 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

20 DECEMBER 2012

6. Date on which issuer notified

27 DECEMBER 2012

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

BELOW 15%

8. Notified details

(A) Voting rights attached to shares

Number of voting rights - Direct - N/A

Number of voting rights - Indirect - 53,385,671 - 14.3%

(B) Financial Instruments

N/A

(C) Financial Instruments with similar economic effect to Qualifying Financial Instruments

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 - 2,518,227

Percentage of voting rights - Nominal - 0.67% Delta - 0.67%

Total A + B + C

Number of voting rights - 55,903,898

Percentage of voting rights - 14.98%

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

BLACKROCK INVESTMENT MANAGEMENT (UK) LIMITED - 55,903,898 (14.98%)

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

ANDREW MANCHESTER

15. Contact telephone number

020 7743 5773

Notification authorised by:

ROBBIE M B BROWN, COMPANY SECRETARY

28 DECEMBER 2012

END

-0- Dec/28/2012 12:43 GMT