13. Section 11B of the Principal Act is amended by inserting the following after subsection (1):

“(1A) Where a planning authority to which subsection (1) relates has not commenced the preparation of a development plan in accordance with this section before the initial making of the relevant regional spatial and economic strategy, then the reference in that subsection to ‘within 12 months of the making of regional planning guidelines that take into account the amalgamation of the administrative areas concerned’ shall be read as a reference to ‘no later than 26 weeks after the making of the initial regional spatial and economic strategy that takes into account the amalgamation of the administrative areas concerned’.”.