12. Section 11 of the Principal Act is amended by substituting the following for subsection (1):

“(1) (a) Not later than 4 years after the making of a development plan, a planning authority shall, subject to paragraph (b), give notice of its intention to review its existing development plan and to prepare a new development plan for its area.

(b) For the purpose of enabling the incorporation of the National Planning Framework and a regional spatial and economic strategy into a development plan—

(i) where notice of a development plan review to be given in accordance with paragraph (a) is prior to the making of the relevant regional spatial and economic strategy, then notice of the review shall be deferred until not later than 13 weeks after the relevant regional spatial and economic strategy has been made,

(ii) where a development plan review referred to in paragraph (a) has commenced and a draft plan has not been submitted to the members of the planning authority concerned in accordance with subsection (5)(a) prior to the making of the relevant regional spatial and economic strategy, then the review process shall be suspended until not later than 13 weeks after the making of the relevant regional spatial and economic strategy,

(iii) where notice of a development plan review to be given in accordance with paragraph (a) would, but for this subparagraph, be more than the period of 26 weeks after the making of the relevant regional spatial and economic strategy, then each planning authority concerned shall, within that period, either—

(I) give notice of a development plan variation in accordance with section 13, or

(II) give notice of a development plan review.”.