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TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii):

   HYD LN GB0004499488

2. Reason for the notification (please state Yes/No): 

An acquisition or disposal of voting rights: ( YES )

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: ( )

An event changing the breakdown of voting rights: ( )

Other (please specify) : ( )

3. Full name of person(s) subject to the notification obligation (iii):

   KBC Asset Management Ltd. (As controller of the voting rights directly or 

  indirectly via a subsidiary.)

4. Full name of shareholder(s) (if different from 3.) (iv):

   KBC Asset Management Ltd.

  Samsung Investment Trust Water Fund (a Korean Collective Investment Scheme (CIS)

  KBC Eco Fund Water (sub fund of KBC Master Investment Fund, an Irish domiciled CIS)

  KBC Liontamer Global Water Fund (an Australian domiciled fund) a client of KBC Asset 
  Management Ltd. 

  KBC Water Fund ( sub fund of the KBCAM Institutional Fund plc, an Irish domiciled 
  Investment company managed by KBC Asset Management Ltd)

   KBC Asset Management International Ltd.-(Subsidiary of KBC Asset Management Ltd)

  KBCAM Eco Water Fund (sub fund of KBC Investment Trust, a US domiciled 
  commingled fund)

  Painters & Allied Trades Discount Council No35 Pension Fund (A US pension fund)

   KBC Asset Management NV.

  (Portfolios managed by KBC Asset Management Ltd on behalf of KBC Asset Management NV 
  and thereby controlling the voting rights)

  KBC Eco Fund Water (sub fund of KBC ECO Fund, Belgian domiciled CIS)

  KBC Eco Fund CSOB Water (sub fund of KBC ECO Fund, Belgian domiciled CIS)

5. Date of the transaction (and date on which the threshold is crossed or  reached if different) (v):

   Consolidated holdings breaching 3% limit on 17/06/2008. 

  17/06/08 moved from 5.29% to 4.85% due to sales.

6. Date on which issuer notified:

   18/06/2008

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

   The 3% threshold is breached, current holding is 4.85%.

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if possible using the ISIN CODE	Situation previous to the Triggering transaction (vi)
	Number of shares	Number of voting Rights (viii)
GB0004499488	753,862	753,862

Resulting situation after the triggering transaction (vii)

Class/type of shares if possible using the ISIN CODE	Number of shares	Number of voting rights (ix)		% of voting rights
	Direct	Direct (x)	Indirect (xi)	Direct	Indirect
GB0004499488	690,673	0	690,673	0	4.85%

B: Financial Instruments

Resulting situation after the triggering transaction (xii)

Type of financial instrument	Expiration Date (xiii)	Exercise/Conversion Period/ Date (xiv)	Number of voting rights that may be acquired if the instrument is exercised/ converted.	% of voting rights
		N/A

Total (A+B)

Number of voting rights	% of voting rights
690,673	4.85%

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

  N/A

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:

   Tony Hollox

15. Contact telephone number:

 +44 (0) 1275 878371

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