Holding(s) in Company

Northumbrian Water Group PLC
07 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 - 985,590
                                              Vidacos Nominees - 59,989,348
                                              HSBC Nominees - 893,021
                                              Mellon Bank, Pittsburgh - 461,782
                                              State Street Trust & Banking Co
                                              (London) - 8,742,589
                                              Trust & Custody Services JP -
                                              933,751

  5.  Number of   6.  Percentage of       7.  Number of     8.  Percentage of
      shares/         issued class (any       shares/           issued class
      amount of       treasury shares         amount of         (any treasury
      stock           held by the             stock             shares held by
      acquired        listed company          disposed          the listed
                      should not be                             company should
                      taken into                                not be taken
                      account when                              into account
                      calculating                               when calculating
                      percentage)                               percentage)
      750,000         Not disclosed           N/A               N/A

  9.  Class of security                  10.  Date of      11.  Date listed
                                              transaction       company informed
      Ordinary 10p shares                     Not               07/12/2006
                                              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)
      72,865,166                              14.04%


 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: 7 December 2006





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