Theresa May has signalled 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 on Monday would be constructive but warned they "will not agree on everything".

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.

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."

First Minister Nicola Sturgeon has warned May that she must take proposals from the devolved administrations seriously at a meeting of the Joint Ministerial Committee (JMC) in Cardiff.

She 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".

The First Minister said: "It is becoming clearer with every day that passes that the UK Government is determined to pursue a hard Brexit and I am determined to do all I can to protect Scotland from the devastating impact that would have.

"In Scotland's Place In Europe we have set out a range of propositions to keep Scotland in the single market and these will be discussed at tomorrow's meetings. I hope the discussion on this tomorrow will be meaningful, but the process has been deeply disappointing so far."

She added: "Time is running out for the Prime Minister to demonstrate that she is going to uphold the commitment she made to me shortly after taking office that Scotland will be fully involved in discussions to develop an agreed UK approach and listen to alternative proposals for Scotland."

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.

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: "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.

"I will lay out the reasonable and achievable objective of the north being designated special status within the EU."