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 PipeHawk plcattached:ii 2. Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights X

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 Mrs Jacquiline H Creswellnotification 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 18 April 2013reached: v 6. Date on which issuer notified:

22 April 2013

7. Threshold(s) that is/are crossed or 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 if possible Number Number Number Number of voting % of voting rights xusing of of of shares rightsthe ISIN Shares VotingCODE Rights Direct Direct xi

Indirect xii Direct Indirect

ORD 0 0 1,000,000 1,000,000 3.03GB0003010609 B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration Exercise/ Number of voting % of votinginstrument date xiii Conversion Period xiv rights that may be rights 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 period instrument refers to xix, xxinstrument xviii Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 1,000,000 3.03

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: N/A 11. Number of voting rights proxy holder will cease N/Ato hold: 12. Date on which proxy holder will cease to hold N/Avoting rights: 13. Additional information: 14. Contact name: Robin Creswell

15. Contact telephone number: