You won't. Trust me. No more free trade with the and that includes Banking. Your economy will implode. You are aware that 80% of the UK's GNP comes from trade of goods and services with the EU, yes? That'll go away pending renegotiation. There will be loads of available office space in London's City. You will have to negotiate each and every small item with them, just like Switzerland and it's tedious, very tedious.