Part 2: Criminal liability for vehicle use Chapter 1: Legal position of the user-in-charge Section 51: Supplementary provision
This section makes supplementary provision in relation to sections 47 to 50.
	Subsection (1) establishes a presumption that an enactment passed or made after the Act is passed is to be read as subject to sections 47 to 49, unless there is a clear intention to the contrary. "Enactment" is defined in section 52(3) and includes subordinate legislation within the meaning of the Interpretation Act 1978, section 21(1), and Welsh and Scottish primary and subordinate legislation.
	Subsections (2) and (3) set out how the burden of proof applies in criminal proceedings in relation to sections 47(1) and 48(1) and (2). Subsection (2) provides that the person seeking to rely on the user-in-charge immunity in section 47(1) bears the burden of proving that the individual concerned was the user-in-charge at the relevant time, and that the exception in section 48(1) regarding transition demands does not apply. Subsection (3) clarifies that a person who seeks to rely on section 48(2) must adduce sufficient evidence to raise an issue, in which case section 48(2) is then to be taken to apply unless the contrary is proved beyond reasonable doubt.
	Subsection (4) and (5) clarify that if an individual could not reasonably be expected to know of any variation, suspension or withdrawal of the authorisation of the self-driving feature of a vehicle and continues to use the vehicle as if the previous authorisation remains, then sections 47 to 49 and regulations under section 50 apply as if the variation, suspension or withdrawal had not occurred.