Accounts: All shops with which you have an account - late payment could cost you unnecessary interest
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Bank: Any you have dealings with
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Car Registration: Write to DVLA (Swansea SA6 7JL) giving details of your car and registration
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Council Tax: Departments of both areas. 
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Dentist/Doctor: De-register and re-register with new practices.
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Electricity, Gas & Water: at least three days in advance and ask for a meter reading on the day. Don't forget to sign on with the company for your new home. 
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Hospital or Clinic: If receiving treatment
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Income Tax: The address is on your tax forms
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Insurance: House, contents, car and yourselves
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Mail: Arrange for mail to be forwarded
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Pensions: Company pension - inform the pension office. State pension - ask at the Post Office
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Schools: As soon as possible
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Standing Orders: tell any companies you pay. 
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Mobile, Telephone & Internet: Arrange for the bills to change address on the correct day for your new line to be connected. 
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Television Licence: Online or at the Post Office