The European Union should not "drag its feet" in negotiating Brexit, a British government source said on Sunday ahead of a fresh round of UK-EU divorce talks in Brussels this week.
"As the EU itself has said, the clock is ticking so neither side should drag its feet," the source said.
The Brexit ministry in a statement also called for the European Commission to be "more flexible", as British negotiators push for talks on future trade ties alongside the divorce.
"Conversations about our exit and the future deep and special partnership we want with the EU are inextricably linked," the ministry said.
But the EU says there must first be "sufficient progress" on three issues - the status of EU nationals in Britain, the bill for the divorce and the future of Northern Ireland's border with the Irish republic.
An EU official told a press briefing on Friday that there was "a very big gap" between "where we are and where we need to be" and there was a "lack of substance" in the negotiations so far.
The official said it was "unlikely" there would be "major steps" in the coming days of talks.
The ministry said the negotiations between Brexit minister David Davis and Michel Barnier, the EU's chief negotiator, would begin on Monday and wrap up on Thursday.
The precise date for the start had been in doubt, as Monday is a public holiday in Britain.
Britain said it had shown a "pragmatic approach" in a series of position papers in recent weeks on future trade ties, the Irish border and post-Brexit dispute resolution mechanisms.
But EU officials have been highly critical of the negotiating proposals.
The British government source said this week's talks would be mostly technical and would be "a stepping stone to more substantial talks in September".
Britain voted to leave the EU in a referendum last year and Prime Minister Theresa May issued a formal notification in March, starting a two-year negotiating timetable to exit.
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