http://www.legislation.gov.uk/ukpga/1972/20/section/6/enactedRoad Traffic Act 1972Road traffic offencesVehiclesRoad safetyDriving licencesHeavy goods vehiclesKing's Printer of Acts of Parliament2019-12-02 PART I 6 1 If a person drives or attempts to drive a motor vehicle on a road or other public place, having consumed alcohol in such a quantity that the proportion thereof in his blood, as ascertained from a laboratory test for which he subsequently provides a specimen under section 9 of this Act, exceeds the prescribed limit at the time he provides the specimen, he shall be guilty of an offence. 2 Without prejudice to subsection (1) above, if a person is in charge of a motor vehicle on a road or other public place having consumed alcohol as aforesaid, he shall be guilty of an offence. 3 A person shall not be convicted under this section of being in charge of a motor vehicle if he proves that at the material time the circumstances were such that there was no likelihood of his driving it so long as there was any probability of his having alcohol in his blood in a proportion exceeding the prescribed limit. 4 In determining for the purposes of subsection (3) above the likelihood of a person's driving a motor vehicle when he is injured or the vehicle is damaged, the jury, in the case of proceedings on indictment, may be directed to disregard, and the court in any other case may disregard, the fact that he had been injured or that the vehicle had been damaged.