18.—(1) Every vesting order by which a local authority acquire any derelict site under this Act shall be in the prescribed form and shall have attached thereto a map showing the land to which it relates.

(2) A vesting order shall be expressed and shall operate to vest the derelict site to which it relates in the local authority in fee simple free from encumbrances and all estates, rights, titles and interests of whatsoever kind on a specified date (in this Act referred to as the vesting date) not earlier than twenty-one days after the making of the order.

(3) Notwithstanding anything in subsection (2), where a local authority have acquired by a vesting order a derelict site which is subject, either alone or in conjunction with other land, to a purchase annuity, payment in lieu of rent, or other annual sum (not being merely a rent under a contract of tenancy) payable to the Irish Land Commission or to the Commissioners of Public Works in Ireland, the authority shall become and be liable, as from the date on which the derelict site is vested in them by the vesting order, for the payment to the Irish Land Commission or to the Commissioners of Public Works in Ireland, as the case may be, of the annual sum or such portion thereof as shall be apportioned by the Irish Land Commission or by the Commissioners of Public Works in Ireland, as the case may be, on the derelict site as if the derelict site had been transferred to the authority by the owner thereof on that date.

(4) When a local authority make a vesting order in relation to any derelict site, they shall send the order to the registering authority and thereupon the registering authority shall cause the local authority to be registered as owner of the land in accordance with the order.

(5) (a) Where a local authority are satisfied on the application of any person interested that a vesting order contains an error or mistake, whether occasioned by the local authority by whom such vesting order was made or otherwise, the local authority may, by order, amend such vesting order, provided such error or mistake may be rectified without injustice to any person.

(b) Where a local authority make an order under this subsection amending a vesting order, the registering authority shall on the lodgment with them of a copy of such amending order rectify the register in such manner as may be necessary to make such register conformable with such amending order.