BBC News:  

The EU’s chief negotiator has ruled out allowing the UK to collect customs duties on its behalf, a key UK proposal for post-Brexit trade. Michel Barnier said the UK wanted to “take back control” of its money, law and borders – but so did the EU.

The EU would not delegate “excises duty collection to a non-member”, he said. Both he and UK Brexit Secretary Dominic Raab said progress had been made but “obstacles” remained before reaching a deal in October.

Mr Raab said: “We have agreed to meet again in mid-August and then to continue weekly discussions to clear away all the obstacles that line our path, to a strong deal in October – one that works for both sides.”

He replaced David Davis, who quit as Brexit secretary in protest at Theresa May’s plans for a future economic relationship between the UK and EU, as set out in the White Paper.

That set out in more detail the government’s proposed customs system, the Facilitated Customs Arrangement for goods and agri-foods. The UK’s plan involves it collecting some EU tariffs – in a bid to ensure frictionless trade in goods and to avoid a hard border in Northern Ireland.

But Mr Barnier said retaining control of the money, law and borders also applied to the EU’s customs policy.

“The EU cannot and the EU will not delegate the application of its customs policy and rules and VAT and excises duty collection to a non-member who would not be subject to the EU’s governance structures,” he said.

Any customs arrangement or union “must respect this principle”, he said

BBC assistant political editor Norman Smith said Mr Barnier appeared to have delivered a significant blow to Mrs May’s controversial proposals, which have already been criticised by pro-Brexit Tory MPs.

Speaking after talks with Mr Raab, Mr Barnier said that Theresa May’s Brexit White Paper plan was a “real step forward”. He highlighted agreement on security measures and said both sides wanted a wide-ranging free trade deal. But he added: “To be frank, we are not at the end of the road yet.”

While UK proposals on security marked “a real step forward” and he welcomed the acknowledgement that the European Court of Justice was the only arbiter of EU law, he added: “In contrast, on our future economic relationship, it comes as no surprise that finding common ground between the EU27 and the UK is more difficult.”