Brexit ministers have demanded Philip Hammond pays for hundreds of extra officials amid fury that departments have been forced to find cuts.

Senior figures in the three Whitehall departments delivering Brexit have told The Telegraph that the Treasury must agree to tens of millions of extra funding.

Failure to do so would undermine “Britain's trading future" and a drive to forge new links across the world, ministers will argue in spending talks.

Both the Foreign Office and the Trade Department have been ordered to outline 6 per cent spending cuts, though the Brexit Department is exempt.

The growing row comes after a damaging week for the Chancellor as he was forced to scrap a key part of his first ever Budget.

On Wednesday it was announced that a planned rise in national insurance for the self-employed would be ditched because it clashed with a manifesto promise.