Just weeks before the 1970 general election which made him Prime Minister, Edward Heath declared that it would be wrong if any Government contemplating membership of the European Community were to take this step without `the full hearted consent of Parliament and people'.
However, when it came to it Heath didn't have a referendum because opinion polls at the time (1972) showed that the British people were hugely opposed (by a margin of two to one) against joining the Common Market. Instead, Heath merely signed the documents that took us into what became the European Union on the basis that Parliament alone had passed the European Communities Bill of 1972.
Precedents show that the British constitution (which may not be written and formalised in the same way as the American constitution is presented) but which is, nevertheless, enshrined and codified in the Magna Carta (1215), the Petition of Right (1628), the Bill of Rights (1689) and the Act of Settlement (1701) requires Parliament to consult the electorate directly where constitutional change which would affect their political sovereignty is in prospect. (The 1689 Bill of Rights contains the following oath: `I do declare that no foreign prince, person, prelate, state or potentate hath or ought to have jurisdiction, power, superiority, pre-eminence or authority within this Realm.' Since this Bill has not been repealed it is clear that every treaty Britain has signed with the EU has been illegal.)