Company number: 02366661. Thames Water Utilities Limited Registered in England and Wales. Registered Office: Clearwater Court, Vastern Road, Reading RG1 8DB. Download a copy of your bill, change your details, update your Direct Debit, choose to go paperless..and much more! Thames Water Utilities Limited Registered in England and Wales. Company number: 02366661. Company number: 02366661. Manage your account online. Registered Office: Clearwater Court, Vastern Road, Reading RG1 8DB. Registered Office: Clearwater Court, Vastern Road, Reading RG1 8DB. Having an online account means that you can do loads of things quickly and easily. Thames Water Utilities Limited Registered in England and Wales.