Holding in Company

Thames Water PLC 26 September 2000 Schedule 10 - Notification of Major Interests in Shares 1 Name of company: Thames Water Plc 2 Name of shareholder having a major interest: AXA S.A. of 40 rue du Colisee, 75008 Paris and its subsidiaries 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: Non beneficial interest 4 Name of registered holder(s) and, if more than one holder, the number of shares held by each of them: HSBC Global Custody Nominee(UK)Limited - 8,500 Mariner House, Pepys Street, London EC3N 4DA a/c: 845030 HSBC Global Custody Nominee(UK)Limited -7,182 Mariner House, Pepys Street, London EC3N 4DA a/c: 845315 HSBC Global Custody Nominee(UK)Limited - 917,582 Mariner House, Pepys Street, London EC3N 4DA a/c: 845017 HSBC Global Custody Nominee(UK)Limited - 125,039 Mariner House, Pepys Street, London EC3N 4DA a/c: 845005 Chase Nominees Ltd - 467,679 Trinity Tower, 9 St Thomas Moore Street, London EC1 a/c: 00994 HSBC Global Custody Nominee (UK) Limited - 143,916 Mariner House, Pepys Street, London EC3N 4DA a/c 880868 Sun Life International - 229,166 Isle of Man, Limited a/c a/c: SLI 11 (Registration details to follow) - 210,257 Chase Nominees Limited - 320,833 a/c: BTO1C Axa Equity & Law Life Assurance - 1,270,450 Society plc, 107 Cheapside, London, EC2V 6DU as AELLAS plc HSBC Global Custody Nominee(UK)Limited - 1,507,229 Mariner House, Pepys Street, London EC3N 4DA a/c: 867116 HSBC Global Custody Nominee(UK)Limited - 1,307,739 Mariner House, Pepys Street, London EC3N 4DA a/c: 867268 HSBC Global Custody Nominee(UK)Limited - 434,777 Mariner House, Pepys Street, London EC3N 4DA a/c: 867050 Smith & Williamson Nominees Ltd - 10,270 1 Riding House Street, London W1A 3AS a/c: S66 RBSTB nominees designation Sunpen - 35,574 67 Lombard Street, London, EC3P 3DL HSBC Global Custody Nominee(UK)Limited - 467,610 Mariner House, Pepys Street, London EC3N 4DA a/c: 867396 HSBC Global Custody Nominee(UK)Limited - 214,110 Mariner House, Pepys Street, London EC3N 4DA a/c: 867530 HSBC Global Custody Nominee(UK)Limited - 1,484,974 Mariner House, Pepys Street, London EC3N 4DA a/c: 867372 HSBC Global Custody Nominee(UK)Limited - 809,799 Mariner House, Pepys Street, London EC3N 4DA a/c: 776934 HSBC Global Custody Nominee(UK)Limited - 2,840 Mariner House, Pepys Street, London EC3N 4DA a/c: 785078 HSBC Global Custody Nominee(UK)Limited - 13,015 Mariner House, Pepys Street, London EC3N 4DA a/c: 873426 HSBC Global Custody Nominee(UK)Limited - 121,471 Mariner House, Pepys Street, London EC3N 4DA a/c: 837914 HSBC Global Custody Nominee(UK)Limited - 312,705 Mariner House, Pepys Street, London EC3N 4DA a/c: 867815 HSBC Global Custody Nominee(UK)Limited - 18,850 Mariner House, Pepys Street, London EC3N 4DA a/c: 777086 HSBC Global Custody Nominee(UK)Limited - 8,519 Mariner House, Pepys Street, London EC3N 4DA a/c: 777094 HSBC Global Custody Nominee(UK)Limited - 7,000 Mariner House, Pepys Street, London EC3N 4DA a/c: 777124 HSBC Global Custody Nominee(UK)Limited - 20,778 Mariner House, Pepys Street, London EC3N 4DA a/c: 777167 Barclays Nominees Ltd - 275,000 PO Box 1043, Willow Grove House,Windsor, Trowbridge, Wiltshire, BA14 0YT a/c: 6000BQ Bank Generale Luxembourg - 96,378 Midland Bank, Pepys Street, London EC3N 4DA a/c: 750749 HSBC Global Custody Nominee(UK)Limited - 165,889 Mariner House, Pepys Street, London EC3N 4DA a/c: 777035 HSBC Global Custody Nominee(UK)Limited - 38,834 Mariner House, Pepys Street, London EC3N 4DA a/c: 777043 5 Number of shares/amount of stock acquired: 6 Percentage of issued class: 7 Number of shares/amount of stock disposed: 6,160,484 8 Percentage of issued class: 1.75% 9 Class of security: Ordinary shares of 23p each 10 Date of transaction: 25.09.00 11 Date company informed: 26.09.00 12 Total holding following this notification: 11,053,965 13 Total percentage holding of issued class following this notification: 3.14% 14 Contact name for queries: Clare O'Connell 15 Contact telephone number: 0118 939 9240 16 Name of company official responsible for making notification: Janet Ravenscroft 17 Date of notification: 26.09.00 Additional Information:
UK 100