Theresa May has made it clear the devolved administrations will not be given a decisive role in the UK's divorce from the European Union ahead of talks with leaders from across the UK.

The Prime Minister said she hoped the meeting would be constructive but warned they "will not agree on everything".

And she highlighted how the Supreme Court ruling on triggering Article 50 had set out "beyond doubt" that relations with Brussels would be determined by the UK government.

Mrs May said: "We will not agree on everything, but that doesn't mean we will shy away from the necessary conversations and I hope we will have further constructive discussions today.

"We have also had the Supreme Court judgment which made clear beyond doubt that relations with the EU are a matter for the UK Government and UK Parliament. We should not forget that that means MPs representing every community in the UK will be fully involved in the passage of Article 50 through Parliament."

Scotland's First Minister has warned Mrs May that she must take proposals from the devolved administrations seriously at a meeting of the Joint Ministerial Committee (JMC) in Cardiff on Monday.

Nicola Sturgeon wants Scotland to remain in the European single market even if the UK leaves, reflecting the majority Remain vote north of the border.

She said the UK Government was showing "no sign whatsoever" of taking Scotland's position "remotely seriously".

Supreme Court Brexit Challenge Show all 13 1 /13 Supreme Court Brexit Challenge Supreme Court Brexit Challenge People wait to enter the public gallery outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge Gina Miller, co-founder of investment fund SCM Private arrives at the Supreme court in London on the first day of a four-day hearing Getty Supreme Court Brexit Challenge A man waves the EU flag in front of the Supreme Court Getty Supreme Court Brexit Challenge Satirical artist Kaya Mar poses with two of his paintings in front of the Supreme Court Getty Supreme Court Brexit Challenge Pro-Europe protestors dressed as Supreme Court Justices stand outside the Supreme Court ahead of the first day of a hearing into whether Parliament's consent is required before the Brexit process can begin. The eleven Supreme Court Justices will hear the government's appeal, following the High Court's recent decision that only Parliament can trigger Article 50 Getty Supreme Court Brexit Challenge The eleven Supreme Court Justices will hear the government's appeal, following the High Court's recent decision that only Parliament can trigger Article 50 Getty Supreme Court Brexit Challenge Businesswoman Gina Miller arrives at the Supreme Court ahead of the first day of a hearing into whether Parliament's consent is required before the Brexit process can begin Getty Supreme Court Brexit Challenge Attorney General Jeremy Wright arrives at the Supreme Court in London EPA Supreme Court Brexit Challenge Protesters outside the Supreme Court in London, where the Government is appealing against a ruling that the Prime Minister must seek MPs' approval to trigger the process of taking Britain out of the European Union PA wire Supreme Court Brexit Challenge A protesters wearing a judge's wigs and robes stands outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge A protester holds up a placard outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters Supreme Court Brexit Challenge Pro-Europe protestors dressed as Supreme Court Justices stand outside the Supreme Court Getty Supreme Court Brexit Challenge A man waiting to enter the public gallery waves a European Union flag outside the Supreme Court ahead of the challenge against a court ruling that Theresa May's government requires parliamentary approval to start the process of leaving the European Union, in Parliament Square, central London Reuters

Proposals to remain in the single market have also been put forward by Welsh First Minister Carwyn Jones and Plaid Cymru leader Leanne Wood.

Calls for alternative settlements for the devolved administrations are on the agenda for the meeting.

It is also expected to focus on ways to help UK businesses to trade and invest in the run-up to Brexit.

Brexit Secretary David Davis, International Trade Secretary Liam Fox and the Secretaries of State for Scotland, Wales and Northern Ireland will also attend.

Mrs May said ministers from each nation had met three times since she had set out plans last October to "fully engage" with the devolved administrations during the planning for Britain's exit from the EU.

She added: "The United Kingdom voted to leave the EU, and the UK Government has a responsibility to deliver on that mandate and secure the right deal for the whole of the UK. We all have a part to play in providing certainty and leadership so that together we can make a success of the opportunities ahead."

Sinn Fein leader Michelle O'Neill, who is attending the talks, said the Conservatives were attempting to impose Brexit against the will of the people in Northern Ireland.

She said: "It is clear that Tory Government is seeking to impose Brexit against the will of the people in the north and of the people of Scotland. The Tory Government have effectively set aside the democratic process to pursue their own narrow political agenda. We need all of those opposed to Brexit to stand together.