Hew Bruce-Gardyne has sent me an interesting link.

This page contains the text of the Government
produce pamphlet advocating a vote to stay in the "European Community
(Common Market)" in the 1975 British Referendum on continuing British
membership.

I’d never seen it before but there it is in all it’s glory. My favourite line:

The British Parliament in
Westminster retains the final right to repeal the Act which took us
into the Market on January 1, 1973. Thus our continued membership will
depend on the continuing assent of Parliament.

We can leave any time we want….so, who’s going to move the bill ?