Changes to Council Directive 94/55/EC of 21 November 1994 on the approximation of the laws of the Member States with regard to the transport of dangerous goods by road
EU Directive 1994/55
Made by Commission Directive 2004/111/EC of 9 December 2004 adapting for the fifth time to technical progress Council Directive 94/55/EC on the approximation of the laws of the Member States with regard to the transport of dangerous goods by road
From legislation.gov.uk's record of changes, the official one: see it there.