Britain and the European Commission have reached agreement on a transition deal which will allow talks on the future trade relationship to be triggered later this week.

Brexit Secretary David Davis hailed the agreement as a “significant step” following talks with EU chief negotiator Michel Barnier in Brussels.

But Mr Barnier cautioned that some issues remained to be settled, including the thorny question of the Irish border and the governance of the eventual withdrawal agreement.

Under the terms of the joint legal text agreed by Mr Barnier and Mr Davis, the UK will be able to negotiate and ratify trade deals with outside countries following Brexit Day in March 2019, to enter into force after the end of a transition period lasting until the end of 2020.

EU citizens arriving in the UK during the transition, as well as Britons settling on the Continent, will have the same rights as those in place before Brexit Day, said Mr Barnier.

Countdown to Brexit: key events (PA Graphics)
Countdown to Brexit: key events (PA Graphics)

The agreement must be approved by EU leaders meeting at the European Council summit on March 22 and 23. This will allow vital negotiations on future EU/UK trade relations to get under way in earnest.

Talks will continue on outstanding issues over the summer before a final text of the withdrawal is agreed in October and sent to the European and UK Parliaments for ratification.

Speaking alongside Mr Barnier at a Brussels press conference, Mr Davis said: “The deal we have struck today, on top of that agreed in December, should give us confidence that a good deal for the United Kingdom and the European Union is closer than ever before.”

The pound jumped by almost 1% against the dollar to 1.40 US dollars following news of the agreement.

Sterling was trading up 0.7% against the euro at 1.14 euro.

Prime Minister Theresa May said: “Prior to December, people questioned whether we would get agreement then. We did. People questioned whether we would get agreement now. We have.

“I think what this shows is that, with goodwill on both sides, working hard, we can get an arrangement for the future which will be in the interests of the UK and in the interests of the European Union and it will be good for all parts of the UK.”

The European Commission’s proposals for “backstop” arrangements for the Irish border remain in the new text, despite being angrily rejected by Mrs May when first published last month. They will be the subject of intense negotiation in the months leading up to the deadline for a final agreement in October.

How public opinion of Theresa May's Brexit negotiations has changed
(PA graphic)

Under the controversial arrangements – to be put in place if the UK fails to come forward with a better solution – Northern Ireland would continue to be considered “part of the customs territory of the Union”, effectively creating a customs border along the Irish Sea.

When first proposed in February, Mrs May said “no UK prime minister could ever agree” to the proposal.

And it is one of a handful of sections of the text released by Mr Barnier and Mr Davis not to be marked either green – signifying “formal agreement” – or yellow – signifying “political agreement with details to be clarified”.

Mr Davis said he had agreed with Mr Barnier on the need to include legal text detailing a “backstop” solution which was acceptable to both sides​.

But he added: “It remains our intention to achieve a partnership that is so close as to not require specific measures in relation to Northern Ireland, and therefore we will engage in detail on all the scenarios set out in the joint report.”

On the key issue of fishing rights, the new text states that the UK will be “consulted” on the allocation of quotas during the transition period.

Mr Davis said this arrangement would apply only to 2019 and included a guarantee that the UK’s share of the total catch cannot be changed.

“Through 2020 we will be negotiating fishing opportunities as an independent coastal state, deciding who can access our waters and on what terms,” he said.

Shadow Brexit secretary Sir Keir Starmer said: “This agreement could have been signed months ago but ministers wasted time fighting among themselves, holding out on negotiating objectives that they have failed to achieve and pursuing their reckless red lines.

“Labour was the first to call for sensible transitional arrangements because it is the only way to protect jobs and the economy.

“It is welcome that they have finally struck a deal on transition and now the Government must prioritise negotiating a final agreement that protects jobs, the economy and guarantees there will be no hard border in Northern Ireland.”