21.—(1) Within a period of 14 days beginning with the date on which the relevant authority receives a notice of claim it must determine whether it has received sufficient information and evidence to enable it to decide the following matters—
(a)whether the claimant is entitled to compensation under this Part,
(b)where the claimant is so entitled, the amount of the compensation.
(2) If the authority determines that it has not received sufficient information or evidence, it must send the claimant a written notice stating the further information or evidence that it requires.
(3) The claimant must send the authority the information or evidence stated in such a notice within—
(a)a period of 14 days beginning with the date on which the claimant receives the notice, or
(b)such longer period as agreed by the relevant authority in writing.
(4) Within a period of 7 days beginning with the date on which the authority receives further information or evidence following such a notice, it must make the determination referred to in paragraph (1) again (and the other paragraphs of this regulation apply to that new determination).