one more point, (this may be childish) do you think that EU will try to make things hard for UK? UK has a huge task of negotiations not just with EU but all the countries whom they are doing business. I know few major banks are moving there head offices to EU to capture the bigger market. Despite all that i do believe UK is in much much better position because of Pound. If they would have converted to EURO than coming back to your own currency would have devastating results.