There is talk that a UK leave vote would lead to demands for another referendum on Scotland’s independence. An independent Scotland could apply for EU membership.
What would be the impact of Brexit on the Northern Ireland peace process (in which the EU is a partner, and is based on cooperation of NI/UK and Eire within the EU)? What would be the reaction in Wales if it was forced to leave the EU and if it had not voted to do so? No one knows.