Brexit talks on a future trade relationship will only be complicated if the European Union decides to "punish Britain for having the audacity" to leave, Britain's trade minister Liam Fox has said.

He also said that French President Emmanuel Macron was "completely wrong" when he said that Britain was using its media to bluff about a no deal.

Mr Fox said it would not be a nightmare scenario to trade according to World Trade Organisation rules.

"But I would prefer to have a deal," he added.

Mr Fox, speaking on ITV's Peston on Sunday, said Britain would offer the other 27 EU members "further assurance" on its divorce before the next summit in December to push talks forward to a discussion of a future trading relationship.

"I don't know what that number is but it's very clear that we could only have that final number as part of a final agreement, we would want to know what the end state is," Mr Fox said.

"Away from the hyperbole around the divorce bill there is actually a great deal of cooperation going on between us."

After British Prime Minister Theresa May won a reprieve in the talks after a summit last week, the UK government will show the EU that "we are moving in the right direction" on the first phase of talks, which include the so-called divorce bill, he said.

Separately, Labour's foreign secretary Emily Thornberry has said any claims of progress in Brexit talks had to be analysed with a cool head.

She added: "I think what we may be seeing is the Europeans trying to make it clear that it is not their fault that there are these difficulties, the intransigence does not come from their side, it comes from Theresa May's side.

"And in the end I think the reality is intransigence is on Theresa May's side, because she doesn't have the strength or the authority to be able to control her backbenchers, let alone her cabinet, and I think we are heading for no deal, and I think that that is a serious threat to Britain and it is not in Britain's interests for that to happen.

"We will stop that."

Ms Thornberry was also challenged over Labour's policy on the customs unions, having told the Commons last year it would be a "disaster" for British business to leave it.

She said: "We need to be part of a customs union, clearly we do."

She said a customs arrangement would be needed in Ireland, adding: "Of course we need a form of customs union, but in the end what we need is a British-style deal and a British-style agreement, and not sailing off into the mid-Atlantic with no deal at all."