Boris Johnson has told the EU that a free trade deal must be done by 15 October, otherwise the UK will "move on," Sky News reported.

The prime minister said Britain was entering the "final phase" of negotiations, which resume on Tuesday.

"There is no sense in thinking about timelines that go beyond that point," he said.

"The EU have been very clear about the timetable. I am too. There needs to be an agreement with our European friends by the time of the European Council on 15 October if it's going to be in force by the end of the year.

"So there is no sense in thinking about timelines that go beyond that point. If we can't agree by then, then I do not see that there will be a free trade agreement between us, and we should both accept that and move on.

Johnson continued: "We will of course always be ready to talk to our EU friends even in these circumstances. We will be ready to find sensible accommodations on practical issues such as flights, lorry transport, or scientific cooperation, if the EU wants to do that.

"Our door will never be closed and we will trade as friends and partners - but without a free trade agreement."

The prime minister said if a deal cannot be struck they would trade in a similar way to that of Australia, which does not have a comprehensive trade agreement with the EU.

If a deal can be struck, it would be based on a standard free trade agreement like the one the EU has agreed with Canada, Boris Johnson said.

"Even at this late stage, if the EU are ready to rethink their current positions and agree this I will be delighted. But we cannot and will not compromise on the fundamentals of what it means to be an independent country to get it."