12.—(1) Subject to the provisions of this article, the undertaker may, in connection with the carrying out of the authorised development, stop up each of the streets specified in columns (1) and (2) of Schedule 4 (permanent stopping up of streets) to the extent specified and described in column (3) of that Schedule.
(2) No street specified in columns (1) and (2) of Schedule 4 (being a street to be stopped up for which no substitute is to be provided) is to be wholly or partly stopped up under this article unless the condition specified in paragraph (3) is satisfied in relation to all the land which abuts on either side of the street to be stopped up.
(3) The condition referred to in paragraph (2) is that—
(a)the undertaker is in possession of the land; or
(b)there is no right of access to the land from the street concerned; or
(c)there is reasonably convenient access to the land otherwise than from the street concerned; or
(d)the owners and occupiers of the land have agreed to the stopping up.
(4) Where a street has been stopped up under this article—
(a)all rights of way over or along the street so stopped up are extinguished; and
(b)the undertaker may appropriate and use for the purposes of the authorised development so much of the site of the street as is bounded on both sides by land owned by the undertaker.
(5) Any person who suffers loss by the suspension or extinguishment of any private right of way under this article is entitled to compensation to be determined, in case of dispute, under Part I of the 1961 Act.
(6) This article is subject to article 30 (apparatus and rights of statutory undertakers in stopped up streets).