SNP Westminster leader Ian Blackford has demanded the release of a recording allegedly obtained by the Guardian newspaper which depicts the late-night bust up between Boris Johnson and his partner Carrie Symonds.

Speaking exclusively to the Sunday National, Blackford argued that the release of the tape would be in the public interest given the fact that the country faces the possibility of Johnson as prime minister. It is alleged that Symonds was heard telling the Conservative MP to “get off me” and “get out of my flat” in the recording. Police said that there was “no cause for action”.

Yet Blackford claimed Johnson should face proper scrutiny and that the combined House of Commons must consider a no-confidence motion if the former foreign secretary is elected.

“These allegations are in the public domain,” Blackford said. “We don’t know what happened in his girlfriend’s home but if the Guardian do have a transcript then I would argue that, in the circumstances of Boris Johnson putting himself forward to be prime minister and given the seriousness of what has been alleged, that it is in the public interest that this is given an airing.”

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The MP for Skye and Lochaber is one of a growing number of senior figures who believe Johnson is not fit to be prime minister, claiming “words and actions fully demonstrate he is nowhere near fit for the highest office in the land”.

Leading Scottish psychologist Dr Mairead Tagg said the allegations must be taken seriously. “Violence against women is such a major issue – domestic abuse affects so many women – and we cannot have a prime minister that normalises that kind of behaviour,” she said.

“I think Boris Johnson gives a lot of cause for concerns, whether that’s his disrespectful comments about other ethnicities or women, his infidelities and now this report of an incident in his partner’s house. It all speaks to someone who is self-obsessed, who has a sense of entitlement. His behaviour concerns me deeply.”

The National: Former Foreign Secretary Boris Johnson leaves his home in London on Friday morning (Kirsty O'Connor/PA)

She said the reports, combined with footage showing Tory MP Mark Field grabbing an activist by the neck at a black tie dinner and Conservative whips launching an inquiry into allegedly abusive Whatsapp messages sent to MP Antoinette Sandbach by a male colleague – all within 24 hours – suggested deep-seated misogyny in the party. The most recent figures suggest seven out of 10 members are male.

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“The normalisation of gender-based violence here is frankly terrifying. These men clearly have no respect for anybody and they think that bullying and coercion is acceptable,” she added.

Last week, Blackford called Johnson “racist” at PMQs, highlighting comments he has made about Muslims, Africans and Scots, and feels that it is now more important than ever to hold the Tory frontrunner to account. “We are now in a situation where a PM is, in effect, going to be appointed by Tory members,” he said.

“The Commons should reflect very carefully on whether or not there should be a proposition of a no confidence motion in Boris Johnson if he is elected prime minster,” he added.

“I fear for people throughout the UK who face the prospect of this man being imposed upon them. He is completely unfit for office.”

But Blackford pointed out Scotland has a clear alternative. “We need to have the debate about Scotland’s future and we are lucky that we can take our own choices and choose our own future as an independent Scotland,” he said.

At Tory hustings yesterday, Johnson refused to answer questions about his private life, claiming people didn’t “want to hear” about it.