17.—(1) Where a provision of this Act, or of any regulation made under this Act, or of any notice served under this Act, enables representations or objections to be made, or requires documents, particulars or other information to be furnished, before the expiration of a specified period and the last day of the period is a Saturday, a Sunday, a public holiday (within the meaning of the Holidays (Employees) Act, 1973) or any other day on which the principal office of the local authority concerned or the Agency (as the case may be) is closed, the representations, objections, documents, particulars or other information (as the case may be) shall be regarded as having been received before the expiration of that period if received by the local authority or the Agency on the next following day on which the principal office of the local authority or the Agency is open.

(2) In this section “representations or objections” includes submissions and observations.