(1)  A planning authority to which a notice is given under section 40N(1)(a) must submit to the Commission a draft amendment of an LPS, modified as required by the notice, within 28 days or a longer period allowed by the Commission.

(2)  If a notice is given under section 40N(1)(a) in relation to a draft amendment of an LPS, the period referred to in section 40Q(2) does not run in relation to the draft amendment until the period by which the planning authority must submit to the Commission a modified draft amendment of the LPS has expired.