Holding(s) in Company

Northumbrian Water Group PLC
11 December 2006


                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

All relevant boxes should be completed in block capital letters.
  1.  Name of listed company              2.  Name of shareholder with a major
                                              interest

      Northumbrian Water Group plc            Amvescap plc

  3.  Please state whether notification   4.  Name of the registered holder(s)
      indicates that it is regarding          and, if more than one holder, the
      the holding of the shareholder          number of shares held by each of
      named in 2 above; in respect of a       them
      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                                Bank of Ireland (Dublin) - 758,021
                                              Banque Paribas (Frankfurt) -
                                              101,064
                                              Chase Nominees - 635,590
                                              Vidacos Nominees - 59,664,348
                                              HSBC Nominees - 893,021
                                              Mellon Bank, Pittsburgh - 461,782
                                              State Street Trust & Banking Co
                                              (London) - 8,742,589
                                              Trust & Custody Services JP -
                                              908,751

  5.  Number    6.  Percentage of         7.  Number of     8.  Percentage of
      of            issued class (any         shares/           issued class
      shares/       treasury shares           amount of         (any treasury
      amount        held by the listed        stock             shares held by
      of stock      company should not        disposed          the listed
      acquired      be taken into                               company should
                    account when                                not be taken
                    calculating                                 into account
                    percentage)                                 when calculating
                                                                percentage)

      N/A           N/A                         700,000         Not disclosed

  9.  Class of security                  10.  Date of      11.  Date listed
                                              transaction       company informed

      Ordinary 10p shares                     Not               11/12/2006
                                              disclosed

 12   Total holding following this       13   Total percentage holding of issued
      notification                            class following this notification
                                              (any treasury shares held by the
                                              listed company should not be taken
                                              into account when calculating
                                              percentage)

      72,165,166                              13.91%


 14   Any additional            15   Name of contact and telephone number for
      information                    queries

                                     Jayne Powell
                                     0191 301 6704

 16   Name and signature of duly authorised officer of the listed company
      responsible for making this notification

      Jayne Powell, Assistant Company Secretary

      Date of Notification: 11 December 2006





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