A person to whom these Regulations apply shall—
(a) within 14 days after becoming such a person, either—
(i) notify the appropriate authority of his name, address and telephone number (if any); or
(ii) if he has previously supplied that information to the appropriate authority, confirm to the appropriate authority that it is correct;
(b) within 14 days of changing his name, address or telephone number notify the appropriate authority of his new name, address or telephone number;
(c) where he expects to be absent from the United Kingdom for a continuous period of more than 3 months, notify the appropriate authority of that fact before departing;
(d) where he has returned to the United Kingdom following a continuous absence of more than 3 months, notify the appropriate authority of—
(i) his return; and
(ii) his address and telephone number within the United Kingdom,
within 14 days of his return;
(e) as soon as is reasonably practicable, notify the appropriate authority if he believes that he has become medically unfit for service in the armed forces and will remain so for more than 3 months;
(f) as soon as is reasonably practicable, notify the appropriate authority if, having given the notification referred to in paragraph (e) above, he later believes that he is fit for service in the armed forces.