THERESA May has told MPs she can disregard Holyrood’s refusal to give her Brexit bill consent, as “it was the democratic will of the Scottish people to remain in the United Kingdom” in 2014.

The SNP’s leader at Westminster, Ian Blackford, had asked the Prime Minister to amend the EU Withdrawal Bill, but May was not for shifting.

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“I think it is right that we go ahead with measures that not only respect devolution, but ensure we maintain the integrity of our common market,” she told MPs during Prime Minister’s Questions.

Blackford said the Tories were “seeking to veto the democratic wishes of the Scottish Parliament”.

“This is absolutely unprecedented,” he added, telling the Tory leader that she was “breaking the 20-year-old devolution settlement”.

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May told him: “I say to the right honourable gentleman that we want to ensure the integrity of the United Kingdom’s common market, and when he talks about the democratic will he might wish to recall the fact that it was the democratic will of the Scottish people to remain in the United Kingdom.”

May’s refusal to countenance further negotiations was at odds with comments made by David Mundell.

He had hinted at the possibility of concession, telling the BBC’s Good Morning Scotland, “The process of the Bill isn’t complete and our door is always open for discussion with the Scottish Government.”

Tuesday’s debate saw the Tories isolated, as Labour, the LibDems, and the Greens backed the SNP government, in refusing to give consent to the EU Withdrawal Bill.

Responding to this, Mundell managed to insult most of the Scottish Parliament, after he claimed MSPs may not have completely understood what it was they were voting on.

He told the BBC’s Good Morning Scotland: “One of the disappointments I have, not just the vote yesterday, but actually when I reflected upon a lot of content of the debate there did seem to be a fundamental misunderstanding amongst many of the MSPs who contributed actually about what this Bill is about.”

He added: “It’s about a technical process of agreeing things that we’ve already agreed, and that’s why I find it almost incomprehensible that we’ve got into this debate around what’s really a very, very technical issue.”

The minister said he was disappointed by “all the constitutional hoo-ha, all the bickering”.

Mundell said: “What this is all about is managing a situation when powers return from Brussels to the United Kingdom and what needs to be done to ensure certainty when that happens to ensure there is a period of stability.”

Green MSP Ross Greer defended his parliamentary colleagues: “David Mundell hasn’t given a straight answer to a single question I’ve asked him over the last two years so I’d suggest he doesn’t throw stones in the glass house of misunderstanding Brexit.

“It shows just how little the Westminster government respects Scotland that their Cabinet Secretary for Scotland questions MSPs’ ability to make an informed choice, simply because we didn’t make the one he wanted. Most MSPs clearly understand the severe impact Brexit is going to have on jobs and wages in this country,” Greer said.