Britain will face demands to pay billions more into the EU budget following a vote to Remain in Europe on June 23 as Brussels looks to set to ask for more cash from national governments to pay for the unfolding migrant crisis.

The European Parliament has passed a resolution demanding greater spending which - if followed through- would tear a hole in David Cameron’s historic cut to the seven-year EU budget, which was capped at £847bn until 2020.

And in moves that could see Britain asked to increase its current net contributions of £10.4bn a year, the EU vice president for budgets issued ominous warnings last week on the sidelines of an European conference that member states should be “making room for new commitments”.

The unguarded remarks by Kristalina Georgieva to the Chinese state news agency Xinhua have raised fresh fears that Mr Cameron will face calls for big budget increases, particulary when the current settlement comes up for its mid-term review this autumn.

"We have to make sure that our budget for next year absorbs all the commitments made so far to deal with the migration crisis, while at the same time making room for new commitments,” said Ms Georgieva.

"We have exhausted to a great extent flexibilities offered within the budget. Member states and the European Parliament need to allow more room for flexibilities."