Changes made by Council Directive of 26 July 1971 on the approximation of the laws of the Member States relating to gas volume meters (71/318/EEC)
EU Directive 1971/318
No changes made by Council Directive of 26 July 1971 on the approximation of the laws of the Member States relating to gas volume meters (71/318/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.