23.—(1) A claimant who receives a decision notice may request the relevant authority to review its decision.
(2) Such a request must—
(a)be in writing,
(b)be made within—
(i)a period of 14 days beginning with the date on which the decision notice was received, or
(ii)such longer period agreed by the relevant authority in writing, and
(c)include or be accompanied by such information or evidence as the claimant considers relevant.
(3) Within a period of 14 days beginning with the date on which a relevant authority receives such a request it must review its decision under regulation 22.
(4) On reviewing its decision, the authority may—
(a)confirm the original decision, or
(b)substitute a new decision for the original decision.
(5) But on reviewing its decision the authority may not substitute a lesser amount of compensation for that stated in the decision notice.
(6) The authority must send a written notice to the claimant stating its decision on the review and the reasons for that decision.
(7) A notice under paragraph (6) must contain particulars of the claimant’s right to appeal a decision on a review under regulation 24.