They will give you the login details to use the Tell Us Once service which is linked to the Department of Work and Pensions. It means you can cancel things such as their driving license and passport in once easy application.
They will also advise you on how many Copies of an Entry (sometimes called a Death Certificate) you may need. They are £12.50 each, and many places do not accept photocopies. They are used to close down things like bank accounts.
Finally, they will provide the Registrar’s Certificate for Burial or Cremation. If you tell them that we are looking after the arrangements, they should email it directly to us. If you are given a hard copy of this instead, we will need you to bring it to us.