40.—(1) A vehicle which is—
(a)a motor vehicle which first used gas as a fuel for its propulsion before 19th November 1982; or
(b)a trailer manufactured before 19th November 1982 to which there is fitted a gas container,
shall be so constructed that it complies either with the provisions of Schedule 4 or with the provisions of Schedule 5.
(2) A vehicle which is—
(a)a motor vehicle which first used gas as a fuel for its propulsion on or after 19th November 1982; or
(b)a motor vehicle first used on or after 1st May 1984 or a trailer manufactured on or after 19th November 1982 which is in either case equipped with a gas container or a gas-fired appliance,
shall comply with the provisions of Schedule 5.
(3) The requirements of this regulation are in addition to, and not in derogation from, the requirements of any regulations made under powers conferred by the petroleum (Consolidation) Act 1928, the Health and Safety at Work etc. Act 1974, the Control of Pollution Act 1974 or any other Act or of any codes of practice issued under the Health and Safety at Work etc. Act 1974.
(4) In this regulation “gas container”