Uk is a net payer for an abysmal percentage of its GDP. Objectively earns much more from the European Community than the breadcrumbs that spends every year to be a member. It can replace EU subsidies only if the economy and the government income stays the same. And everything as for now is pointing to the opposite. A lot of high paying jobs (and very highly taxed) in banking are moving in Europe, a lot of businesses in the uncertainty are slashing investments, house market together with consumer spending is plummeting. Only a blind person can't see that next year there will be far less money in the government disposal. And, guess what, I don't really think that their first priority would be to reinstate all the subsidies coming from the EU.