The Civil Enforcement of Parking Contraventions (England) General Regulations 2007 (S.I. 2007/3483) provide for the civil enforcement of parking contraventions in England (including Greater London) in accordance with Part 6 of the Traffic Management Act 2004. The 2007 Regulations were amended by the Civil Enforcement of Parking Contraventions (England) General (Amendment No.2) Regulations 2015 (S.I. 2015/1001) to require that a notice of a penalty charge in respect of a parking contravention on a road in a civil enforcement area must be given by a civil enforcement officer affixing it to the vehicle, subject to certain exceptions.
Link: The Civil Enforcement of Parking Contraventions (England) General (Amendment) Regulations 2018
Source: Legislation .gov.uk