A person who has made a claim for benefit may amend it at any time before a determination has been made on the claim by notice in writing received at an appropriate office, by telephone call to a telephone number specified by the Secretary of State or in such other manner as the Secretary of State may decide or accept.

Any claim amended in accordance with paragraph (1) may be treated as if it had been so amended in the first instance.

A person who has made a claim may withdraw it at any time before a determination has been made on it, by notice to an appropriate office, and any such notice of withdrawal shall have effect when it is received.