I find the Left/Right issue concerning Brexit interesting, and I wonder if /how attitudes have changed over the last 50 years or so. Certainly over that period Europe has been the Achilles heel of both main parties (Libs are the only "constant" Europeans).
We now tend to think that Pro Europe is essentially Left, and Anti Europe essentially Right. However, using Lincoln as an example, in the early 70s there was a big bust up between the Lincoln Labour Party, which was quite left wing, and the (Labour) MP Dick Taverne. He was right of centre and pro joining the Common Market, whereas the local Labour party was very much anti - this led to him being deselected as Labour candidate. He won the next election as an independent, and ultimately became a Lib Dem (Margaret Jackson - now Beckett - beat him in the next election)
Have to say in '75 I voted Out in the Referendum, whereas in 2016 I voted Remain.