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 issuerof existing shares to which voting rights are Keller Group PLCattached: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 resultin the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect toqualifying financial instruments An event changing the breakdown of voting rights Other (please specify):

3. Full name of person(s) subject to the BlackRock UK Special Situations Fundnotification obligation:iii

4. Full name of shareholder(s) (if different from 3.):iv 5. Date of the transaction and date onwhich the threshold is crossed or 15th March 2013reached:v 6. Date on which issuer notified: 18th March 2013 7. Threshold(s) that is/are crossed or Holding has gone below 3%reached: vi, vii 8. Notified details: A: Voting rights attached to shares viii, ix

Class/type Situation previous Resulting situation after the triggering transactionof

to the triggeringshares transaction Number Number Number Number of voting % of voting rights xif possible of of of shares rightsusing Shares Votingthe ISIN Rights Direct Direct xi Indirect Direct IndirectCODE xii GB0004866223 2,365,848 2,365,848 N/A N/A N/A Below 3% N/A B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting % of votingfinancial date xiii Conversion Period rights that may be rightsinstrument 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 price Expiration Exercise/ Number of voting rights % of voting rightsfinancial date xvii Conversion instrument refers to xix, xxinstrument period xviii Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights N/A Below 3%

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

Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will ceaseto hold: 12. Date on which proxy holder will cease to holdvoting rights: BlackRock Regulatory 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 notificationobligation Full name BlackRock UK Special(including legal form of legal entities) Situations Fund Contact address 12 Throgmorton Avenue,(registered office for legal entities) London, EC2N 2DL Phone number & email 020 7743 5773; emeadisclosures@blackrock.com 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 legalentity subject to the notification obligation) C: Additional information

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