11.—(1) Where the Commissioners—
(a)are required in accordance with regulation 9 to review a decision, or
(b)agree to do so on such a request as is mentioned in regulation 10(4)
the following provisions of this regulation apply.
(2) On any such review, the Commissioners may—
(a)confirm the decision,
(b)withdraw the decision, or
(c)vary the decision.
(3) Where the Commissioners withdraw or vary the decision, they may also take such further steps (if any) in consequence of the withdrawal or variation as they consider appropriate.
(4) If the Commissioners do not within the permitted period give notice of their determination on the review to the person who required the review or his representative, they shall be taken to have confirmed the decision.
(5) For the purposes of paragraph(4), the “permitted period” is the period of 45 days beginning with the day on which the review—
(a)is required by the person or his representative in accordance with regulation 9, or
(b)is agreed to by the Commissioners as mentioned in regulation 10(4).