This is a little like those quizzes in newspapers that I can never resist: two pictures that look exactly the same but there are five differences and you have to find them. The same can apply to the list of different attitudes to Key EU Policies expressed by the three main parties (the others apparently do not exist) as summarized by Open Europe.
There are, apparently, minute differences - the odd bracelet missing and the handbag has a different clutch. Here and there you get one party being in favour of more integration or partially in favour of more integration or, actually, against more integration but not really knowing a great deal about it.
At the end Open Europe gives its judgement of the differences and try as they might they cannot really show that the Conservatives are that different from the other two. After all, it is only on major transfer of power that they are promising a referendum and nobody can quite define what a major transfer of power is. Nor is it particularly clear how they intend to repatriate powers from the EU. As for the CFP, that all parties wish to reform, the Conservatives had a perfectly good policy that was ditched by the Boy-King as soon as he became leader. It involved Britain pulling out of the CFP and he could not countenance that. In fact, even Open Europe has to admit that neither party advocates withdrawal from the disastrous Common Fisheries Policy. Since wholesale reform is not possible, given its structure, we are at an impasse.