When someone dies the relevant parties that need to be informed can vary from person to person, it is important to let banks, credit card companies and the relevant government organisations such as the Department for Works and Pensions know that death has occurred so that payments may be stopped and this also stops any overpayments happening.
Most Registrar’s will tell you about the service call Tell Us Once, this service lets you inform most of the required departments in one go such as HMRC, Department for Works and Pensions, Driving and Vehicle Licensing Agency, Passport Office and the Local Council.