Career diplomat Sir Tim Barrow will replace Sir Ivan Rogers as the UK's top civil servant in Brussels.

The former ambassador to Russia will take over the crucial role following the surprise resignation of the UK permanent representative just weeks before the expected start of Brexit withdrawal negotiations.

Mr Rogers had hit out at the "ill-founded arguments and muddled thinking" of politicians in a fiery resignation letter.

Mr Barrow was appointed political director general at the Foreign Office last March after leaving his role in Moscow.

He has had two previous stints working as part of the UK's Permanent Representation to the EU.

The swift appointment comes amid demands for Brexit Secretary David Davis to face MPs over Mr Rogers's decision to quit.

Labour called for the government to set out a clear timetable for the publication of its Brexit plans in the wake of the resignation.

The party's Brexit spokesman, Sir Keir Starmer, said Mr Rogers's resignation was likely to be a "significant loss" for Britain and raised "a number of serious questions" about the government's preparations for the talks, which Prime Minister Theresa May has said she will trigger under Article 50 of the EU treaties before the end of March.

In a letter to Mr Davis, Mr Starmer said: "It is now vital that the Government demonstrates not only that it has a plan but also that it has a clear timetable for publication. The best way to clarify these points and wider concerns many people have about this matter would be to make a statement to the House of Commons when Parliament returns on Monday."

Prominent Brexiteers Iain Duncan Smith and Peter Lilley accused Mr Rogers of "sour grapes", while Tory MP Dominic Raab said that the senior diplomat's "heart hasn't really been in Brexit" and his resignation would be "quietly, cautiously and respectfully welcomed at the top of government".

But the Foreign Office's former top civil servant Lord Ricketts attacked the "denigration" of the long-serving mandarin and dismissed suggestions that he was responsible for leaks as "a smear".