Financial services, as with all services, are not part of the EU single market. They however were subject to punitive and restricting legislation from the EU spearheaded by Barnier and El Presidente Barroso (who went on to work for Goldman Sachs) long before 2016. Those restrictions will be slowly rolled back and the UK financial services sector will flourish. I'm not wasting my time reading the clowns of the Guardian but it's a twisted logic to think UK fisheries won't be better off out of the EU, but being able to sell into the EU.
Anyway, you dodged my question so I'll ask it again. Were Gaitskell, Shore, Castle, Foot and Benn anti migrant ? If not, why did they want the UK to leave the EEC, Common Market, EU ?