5(1)In this paragraph—
“action area” means any area indicated by the Greater London Development Plan as an area intended for comprehensive development, redevelopment or improvement as a whole which the Secretary of State has directed shall be treated as an action area, and
“G.L.C. action area” means an action area in whose case it was indicated in the Greater London Development Plan that it was for the Greater London Council, and not a London borough council, to prepare a local plan for that area.
(2)As soon as practicable in the case of any action area other than a G.L.C. action area—
(a)if it is wholly comprised within a London borough, the council of that borough shall prepare a local plan for the area, and
(b)if not, the council of every London borough in which any part of the action area falls shall prepare a local plan for that part,
but this sub-paragraph shall not be taken to require a council to do again anything which they have already done.
(3)Where a council are required by this paragraph to prepare a local plan, they shall take steps for the adoption of that plan.