Holding(s) in Company

Northumbrian Water Group PLC
02 August 2005


                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Name of company

...Northumbrian Water Group plc.................................................

2. Name of shareholder having a major interest

   Amvescap plc as agent for INVESCO Perpetual UK Investment Series (UK
   ICVC).........................................

3. Please state whether notification indicates that it is in respect of holding
of the shareholder named in 2 above or in respect of a non-beneficial interest
or in the case of an individual holder if it is a holding of that person's
spouse or children under the age of 18

...INVESCO Perpetual UK Investment Series (UK ICVC)...........................

4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them

...Vidacos Nominees Limited............................................................

5. Number of shares / amount of stock acquired

...N/A............................................................

6. Percentage of issued class

...N/A............................................................

7. Number of shares / amount of stock disposed

...461,538............................................................

8. Percentage of issued class

...Not disclosed............................................................

9. Class of security

...Ordinary 10p shares............................................................

10. Date of transaction

... 1 August 2005.........................................................

11. Date company informed

... 2 August 2005.........................................................

12. Total holding following this notification

....66,976,284.........................................................

13. Total percentage holding of issued class following this notification

....12.91%.........................................................

14. Any additional information

....Total holding of Amvescap plc for SAR purposes is 99,272,098
    representing 19.14% of total issued share capital........................

15. Name of contact and telephone number for queries

....Martin Parker, Company Secretary, 0191 301 6746.............................

16. Name and signature of authorised company official responsible for making
this notification

....Martin Parker, Company Secretary............................................

Date of notification

2 August 2005.........................................................

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