(1)Where the Mayor has approved a local implementation plan, or a local implementation plan as proposed to be revised, submitted to him under section 146(1) above, the London borough council which submitted the plan—
(a)shall implement the proposals contained in it in accordance with the timetable included by virtue of section 145(3)(a) above, or, as the case may be, section 149(2) above, and
(b)shall implement all the proposals contained in it by the date included by virtue of section 145(3)(b) above, or, as the case may be, section 149(2) above.
(2)Where the Mayor has prepared a local implementation plan or a revised local implementation plan on behalf of a London borough council under section 147 above, or, as the case may be, section 150 above, subsection (1) above shall apply in relation to the implementation by the council of the proposals contained in the plan as if the plan were a local implementation plan approved by the Mayor under section 146 above, or, as the case may be, a local implementation plan as proposed to be revised, approved by the Mayor u der that section.