Changes made by Council Directive of 28 June 1977 on the approximation of the laws of the Member States relating to reversing lamps for motor vehicles and their trailers (77/539/EEC)
EU Directive 1977/539
No changes made by Council Directive of 28 June 1977 on the approximation of the laws of the Member States relating to reversing lamps for motor vehicles and their trailers (77/539/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.