The terms of entrance, or to be accurate remaining, in the Common Market were clear at the time of the 1975 referendum. I was too young to vote but old enough and interested enough to follow the debate. We should have had another referendum when the Common Market morphed into the European Union about the time of Maastricht.
So, having applied the filter further, you will be voting UKIP. For your info they offer 'legal protection' whatever that means, to Christians (but not other religious groups) who object to gay marriage in 2015, although to be fair they changed their policy, which had been anti gay marriage to one of 'not opposing' at the same time.