These include a National Insurance number, as well as the date a person was married or entered into a civil partnership if relevant.

In addition, bank information is important, and those living in a European Economic Area or Switzerland will also need their BIC and IBAN numbers.

While bank details are vital, Britons should also be aware payments cannot be made into an NS&I account, unless other benefits are already paid into the account.

To qualify for a winter fuel payment, while birth date is important, a person must also meet the criteria for what is known as the “qualifying week”.

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