"It follows that, in applying national law, whether the provisions in questions were adopted before or after the Directive, the national court called upon to interpret it is required to do so, as far as possible, in light of the wording and the purpose of the Directive in order to achieve the result pursued by the latter and thereby comply with the third paragraph of article 189 of the Treaty."
"the greater flexibility available to the court in applying a purposive construction to legislation designed to give effect to the United Kingdom's Treaty obligations to the Community enables the court, where necessary, to supply by implication words appropriate to comply with those obligations …"