Changes to Council Directive 76/764/EEC of 27 July 1976 on the approximation of the laws of the Member States on clinical mercury-in-glass, maximum reading thermometers
EU Directive 1976/764
Made by Commission Directive 84/414/EEC of 18 July 1984 adapting to technical progress Directive 76/764/EEC on the approximation of the laws of the Member States relating to clinical mercury-in-glass maximum-reading thermometers
From legislation.gov.uk's record of changes, the official one: see it there.