I still think Corbyn quite likely voted leave,
..... Whereas.. for a major part of that time (see post #7079) the Labour position has been far more 'sceptical'... Indeed, the Labour manifesto of 1983 was to Leave the EEC, after a 'transitional period' (!).. And this was the manifesto under which Tony Blair entered Parliament (his personal campaign literature in 1983 endorsed that position, sorry can't share links on this phone)..
And yes, Corbyn (he of "Oh Jeremy Corbyn"!) has for his whole political career, spoken out against, campaigned against, and voted against at every opportunity, EEC/EU membership, over a political lifetime (see post #7023)..