20. Section 249 of the Principal Act is repealed and the following section substituted:
“249. The approval of an application by the Minister, or by the Executive under section 240 or 241, takes effect—
(a) if no objection to the application has been made under section 237 and whether or not a condition is imposed on the approval—on the day on which the approval is given;
(b) if an objection to the application has been made under section 237 and no application is made to the Appeals Board for a review of the decision within 28 days after the date of the decision—on the day following the expiration of that period of 28 days; or
(c) if application is made to the Appeals Board for a review of the decision to approve the application—on the day on which the Appeals Board decision affirming or varying the decision is made.”.