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21.—(1) A local planning authority which are a London borough council must make a request under section 24(4)(a) of the Act on the day they comply with regulation 19(a).
(2) Where a request is made under section 24(4)(a) of the Act, the Mayor must send the opinion sought to the Secretary of State and the local planning authority within 6 weeks from the day on which the request is made.