Holding(s) in Company

Northumbrian Water Group PLC
04 July 2003

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES


1.     Name of company

       Northumbrian Water Group plc

2.     Name of shareholder having a major interest

       Aviva plc and its subsidiary Morley Fund Management Limited

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.

       As above

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

         4,930,000   - BNY Norwich Union Nominees Ltd
       16,660,000   - Chase GA Group Nominees Ltd
         3,160,000   - CUIM Nominee Ltd

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

       1,500,000

8.     Percentage of issued class

       0.3%

9.     Class of security

       Ordinary 10p Shares

10.    Date of transaction

       30th June 2003

11.    Date company informed

       2nd July 2003

12.    Total holding following this notification

       24,750,000

13.    Total percentage holding of issued class following this notification

       4.77%

14.    Any additional information

15.    Name of contact and telephone number for queries

       Chris Green, 0191 301 6461

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

       Chris Green, Finance Director

Date of notification:   4th July 2003




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