Holding(s) in Company

Northumbrian Water Group PLC
10 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

367,500

8. Percentage of issued class

0.07%

9. Class of security

Ordinary 10 pence shares

10. Date of transaction

9 August 2005

11. Date company informed

10 August 2005

12. Total holding following this notification

62,225,907

13. Total percentage holding of issued class following this notification

11.99% *

14. Any additional information

* Note that the holding by Amvescap for SAR purposes is 93,663,388 (18.05%)

15. Name of contact and telephone number for queries

Jayne Powell, 0191 3016704

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

Jayne Powell, Assistant Company Secretary

Date of notification

10 August 2005

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