Changes to Council Directive of 28 June 1977 on the approximation of the laws of the Member States relating to safety belts and restraint systems of motor vehicles (77/541/EEC)
EU Directive 1977/541
Made by Directive 2005/40/EC of the European Parliament and of the Council of 7 September 2005 amending Council Directive 77/541/EEC on the approximation of the laws of the Member States relating to safety belts and restraint systems of motor vehicles
From legislation.gov.uk's record of changes, the official one: see it there.