There will be howls of outrage in some quarters if it is confirmed that the government has offered the EU a ‘divorce’ bill of up to £50 billion (over several years). Some on the leave side of the debate insist that the bill should be zero. They ask: does the EU not owe us some money for our share of all the bridges we have helped build in Spain and railway lines in Poland? But it was never realistic to think we could leave the EU and maintain good relations with the bloc without paying a penny — even if...