18.—(1) An approved inspector who is of the opinion that any of the work described in an initial notice which has been carried out contravenes any provision of building regulations may give notice in writing to the person carrying out the work specifying—
(a)the requirement of building regulations which in the approved inspector's opinion has not been complied with, and
(b)the location of the work which contravenes that requirement.
(2) A notice of contravention given in accordance with paragraph (1) shall inform the person carrying out the work that if within the prescribed period that person has neither pulled down nor removed the work nor effected such alterations in it as may be necessary to make it comply with building regulations, the approved inspector will cancel the initial notice.
(3) The period within which the person carrying out the work is to remedy the contravention as described in paragraph (2) is three months beginning with the day on which the notice is given.
(4) Form 6 in Schedule 1 is the form of notice to be given by an approved inspector to cancel an initial notice in accordance with section 52(1) of the Act in circumstances referred to in section 52(2) of the Act; where notice of a contravention has been given under that subsection and no further initial notice relating to the work has been accepted, that notice shall specify the contravention.
(5) Form 7 in Schedule 1 is the form of notice to be given by a person carrying out or intending to carry out work to cancel an initial notice in accordance with section 52(3) of the Act.
(6) Form 8 in Schedule 1 is the form of notice to be given by the local authority to cancel an initial notice in accordance with section 52(5) of the Act.