Holding(s) in Company

Northumbrian Water Group PLC
13 May 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

FMR Corp.

Parent holding company of Fidelity Management & Research Company (FMRCO),
investment manager for US mutual funds, and Fidelity Management Trust Company
(FMTC), a US state chartered bank which acts as trustee or investment manager of
various pension and trust accounts.

Fidelity International Limited (FIL).

Parent holding for various direct and indirect subsidiaries, being
non-beneficial holders, including Fidelity Investment Services Ltd (FISL),
Fidelity Gestion (FIGEST), Fidelity Investments Advisory (Korea) Limited (FIA(K)
L). Fidelity Investments Management (Hong Kong) Limited (FIMHK), Fidelity
Pension Management (FPM) and Fidelity Investments International (FII),
investment managers for various non-US investment companies and institutional
clients.

The notifiable interests also comprise the notifiable interest of Mr Edward C
Johnson 3d, a principal shareholder of FMR Corp. and Fidelity International
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 2

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

Registered Name                        Shares held      Management Company
Bank of New York Brussels                      97,000   FIL
Brown Bros Harriman Lux                    13,217,396   FIL
JP Morgan, Bournemouth                        380,200   FIL
National Australia Bank Melbourne             115,100   FIL
Northern Trust London                          60,031   FIL
State Street Bank and Trust Co Ldn            127,100   FIL
JP Morgan, Bournemouth                        508,273   FISL
Brown Bros Harriman                            95,500   FMTC
JP Morgan Chase Bank                           86,900   FMTC
State Street Bank and Trst Co                  63,600   FMTC
Bank of New York Brussels                      28,400   FPM
JP Morgan, Bournemouth                        987,144   FPM
Mellon Bank                                   105,000   FPM
Northern Trust London                         390,866   FPM

                               Total       16,262,510

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
n/a

8) Percentage of issued class
n/a

9) Class of security
Ordinary shares of 10p

10) Date of transaction
Not disclosed

11) Date company informed
12.05.05

12) Total holding following this notification
16,262,510

13) Total percentage holding of issued class following this notification
3.14%

14) Any additional information

The notifiable interests include interest held on behalf of authorised unit
trust schemes in the U.K., notwithstanding the exemption from reporting pursuant
to section 209(1) (h) of the Companies Act 1985.

These notifications of disclosable interests constitute separate notifications
of interest in the shares and are combined solely for the purposes of clarity
and efficiency. Nothing herein should be taken to indicate that FMR Corp. and
its direct and indirect subsidiaries, Fidelity International Limited and its
direct and indirect subsidiaries or Mr Edward C Johnson 3rd act as a group or in
concert in respect of the disclosed interests, or that they are required to
submit these notifications on a joint basis.
The disclosable interests arise under section 208(4)(b) of the Act, namely where
a person, not being the registered holder, is entitled to exercise a right
conferred by the holding of the shares or to control the exercise of such
rights, or under section 203 of the Act respectively.

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 13 May 2005



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