[F139A—(1) Every vehicle to which this regulation applies shall be designed and constructed for running on unleaded petrol.E+W+S
(2) No person shall use or cause or permit to be used a vehicle to which this regulation applies on a road if it —
(a)has been deliberately altered or adjusted for running on leaded petrol, and
(b)as a direct result of such alteration or adjustment it is incapable of running on unleaded petrol.
(3) Subject to paragraph (4) this regulation applies to every motor vehicle which is —
(a)propelled by a spark ignition engine which is capable of running on petrol, and
(b)is first used on or after the 1st April 1991.
(4) Part I of Schedule 3A shall have effect for the purpose of excluding certain vehicles first used before specified dates from the application of this regulation.
(5) In this regulation “petrol”, “leaded petrol” and “unleaded petrol” have the same meaning as in Community Directive 85/210.
(6) A vehicle shall be regarded for the purposes of this regulation as incapable of running on unleaded petrol at any particular time if and only if in its state of adjustment at that time prolonged continuous running on such petrol would damage the engine.]