IT will be a “perversion” of democracy if Boris Johnson denies indyref2 and leaves Scotland “imprisoned” in the Union, Nicola Sturgeon has warned.

In one of her first interviews since the SNP swept to victory at the General Election on Thursday, securing 47 of Scotland’s 59 MPs, and winning 45% of the vote, the First Minister claimed the Tories were “raging against reality”.

Sturgeon, who has said repeatedly that she wants a new referendum in the second half of next year, told the BBC’s Andrew Marr show that she was going to “pursue the plan I won a mandate for”.

Johnson and Sturgeon spoke by phone on Friday night, with the Prime Minister making clear that “he remained opposed to a second independence referendum”.

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The SNP leader told Marr: “It really is such a subversion of democracy that you’re talking to the leader of the party that overwhelmingly won the election, and I’m under pressure to say what I’m doing because the mandate that I won is not going to be honoured by the party that got roundly defeated in Scotland. It is just such perversion and subversion of democracy that it will not hold.”

Sturgeon confirmed that she will “set out this week the detailed, democratic, case for the transfer of power” to Holyrood to allow for a legally watertight referendum to take place.

Speaking about Johnson, she said: “If he thinks – and I said this to him on Friday night on the telephone – that saying no is the end of the matter, he is going to find himself completely and utterly wrong.

“It’s a fundamental point of democracy, you cannot hold Scotland in the Union against its will. You cannot just lock us in a cupboard and turn the key and hope that everything goes away.

“If the United Kingdom is to continue, it can only be by consent and if Boris Johnson is confident in the case for the Union he should be confident enough to make that case and allow people to decide.”

Sturgeon added: “Scotland cannot be imprisoned in the United Kingdom against its will.

“The Tories might rage against the reality of what happened on Thursday for a while, I fully expect that they will, but ultimately they are going to have to face up to and confront that reality because of the will of the Scottish people cannot be ignored, that is just the simple fact of the matter.”

Just last week, the Tories had claimed that the Union was on the ballot paper, but, as Sturgeon told Marr, Scottish voters had deprived Johnson’s party of six MPs and “made clear we want our future in our own hands”.

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She added: “I don’t presume everyone who voted SNP on Thursday is yet prepared to back independence, but it’s not for me to decide that question, it’s not for Boris Johnson to decide, it’s for the people of Scotland.”

Her comments came less than an hour after Michael Gove promised that the Tories would “absolutely” not allow a new independence vote.

Speaking to Sky’s Sophy Ridge on Sunday he said: “We were told in 2014 that would be a choice for a generation, we are not going to have an independence referendum on Scotland.”

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Writing in her weekly Mail on Sunday column, former Scottish Tory leader Ruth Davidson said there was “no denying this was a good result for Nicola Sturgeon and her party”.

She added: “Her vote share went up and she returned more seats. Inevitably, her demands for another independence referendum started before the last seat was counted – with the result cited as justification.”

But, Davidson insisted the SNP’s win did not take them “any further forward than five years ago”.

She added: “There is space therefore for the Prime Minister to ensure the rhetoric of his One Nation vision is matched by reality. He should take it.

“Ensuring promises over Brexit to Scotland’s fishing industry are kept and support for farmers honoured is a good start. Making sure Scotland’s immigration needs – such as four-year student visas and raising the quota for seasonal workers – would help.

“Making a point of allocating extra infrastructure and research spending north of the Border would also be welcome – but what would really settle nerves is using his new-found majority to tack to the centre and return to the liberal, internationalist outlook Mr Johnson exhibited as London mayor.

“The size of the Prime Minister’s majority gives him a freedom denied his predecessors.

“However, that freedom comes with the responsibility to reach out to Scotland, despite SNP attacks and grievance, to ensure no part of the United Kingdom feels left behind during his premiership.”

Meanwhile, Gove insisted the next phase of Brexit negotiations will be concluded by the end of 2020.

He said: “Quite a lot of the details that we need to negotiate is already laid out in the political declaration, so a lot of work has been done.”