The European Communities Act 1972 (c. 68) is an Act of the Parliament of the United Kingdom providing for the incorporation of European Community law into the domestic law of the United Kingdom. It is not to be confused with the European Communities Act 1972 (Ireland) which did the same thing for the Republic of Ireland.
The primary significance of the EC Act 1972 is that (apart from being the instrument whereby the UK was able to accede to the European Union (or 'European Communities' as then termed) it enables under section 2(2) for Government ministers to lay regulations before Parliament to implement required changes to UK law (for example, Decisions of the European Court of Justice and EU Directives). It also provides in section 2(4) that all UK legislation, including primary legislation (Acts of Parliament) shall have effect "subject to" directly applicable EC Law. In the famous Factortame case, the House of Lords (Lord Bridge) has interpreted this provision as inserting an implied clause into all UK statutes that they shall not apply where they conflict with European law, in what was seen as a major departure from the English constitutional doctrine of Parliamentary Sovereignty (see Factortame: Sovereignty and the EU).
The repeal of this Act would leave European Union law unenforceable in the UK, but the UK would still be bound by treaty obligations to the European Union.
Section 11(2) appears to implement Article 194 of the Treaty Establishing the European Atomic Energy Community done at Rome on 25 March 1957. It must be construed and the Official Secrets Act 1911 to 1939 have effect, as if it was contained in the Official Secrets Act 1911 but so that sections 10 and 11, except section 10(4), do not apply.
Acts of Parliament of England to 1601 · 1603–1641 · Interregnum (1642–1660) · 1660–1699 · 1700–1706
Acts of Parliament of Scotland
Acts of the Parliament of Ireland to 1700 · 1701–1800
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