The European Union could survive if the UK left, but not if it lost France, outgoing European Council president Herman van Rompuy said.

He said he believed the other 27 member states would be ready to look seriously at London's demands for change, but not to negotiate on the fundamental principles of the EU, something usually taken to include the crucial issue of EU workers' right of free movement. In a farewell lecture in Paris ahead of his departure at the end of this month, he praised the "constructive" approach taken by Britain during his five-year presidency.