'Brexit' pain for Europe gives Cameron leverage in crucial week

The final deal, which leaders will thrash out at the summit, is a long way from being completed. While diplomats have made some headway over the past 10 days, several key parts remain open as nations push their own causes in areas such as how to protect the voting rights for non-euro members on financial and economic matters.

France, Germany and some other countries are “suspicious” that the UK really wants a veto for the City of London over EU regulation, according to Charles Grant, director of the Centre of European Reform.