<Ul> <Li> C - 106 / 77, Simmenthal (1978) ECR 629, duty to set aside provisions of national law which are incompatible with Union law . </Li> <Li> C - 106 / 89 Marleasing (1991) ECR I - 7321, National law must be interpreted and applied, insofar as possible, so as to avoid a conflict with a Community rule . </Li> </Ul> <Li> C - 106 / 77, Simmenthal (1978) ECR 629, duty to set aside provisions of national law which are incompatible with Union law . </Li> <Li> C - 106 / 89 Marleasing (1991) ECR I - 7321, National law must be interpreted and applied, insofar as possible, so as to avoid a conflict with a Community rule . </Li> <P> Article I - 6 of the European Constitution stated that "The Constitution and law adopted by the institutions of the Union in exercising competences conferred on it shall have primacy over the law of the Member States ." However, the constitution was never ratified but its replacement, the Treaty of Lisbon included the following declaration on primacy: </P>

Explain how eu law takes effect in the uk legal order