The UK went into Europe based on the ideals of the common market, what came after isn't what anybody signed up for
This is a common meme in British politics/public. The idea that "this isn't what we agreed". But I haven't actually seen any evidence for that.
It seems like backwards justification of the right wing british politics to explain why the Tories brought the UK into then EEC and to explain why the British public voted to stay in a few years later, and also to explain why many other countries (a) want to stay in it and (b) want to join.