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A Tory MP was left with a cut on his face after becoming involved in a late-night pub bust-up over Brexit.

Leading Conservative Leaver Matthew Offord, 48, got into a booze-fuelled spat with the Remain-backing activist in Westminster’s St Stephen’s Tavern.

It is understood the pro-EU woman challenged the backbench MP over his Brexit views before violence flared.

An independent witness told the Mirror Mr Offord leapt from his seat crying: “She’s attacking me!” - and the woman called him a “Tory tw*t”.

The MP for Hendon, north London, was left with a graze near his nose, which the witness described as a “scratch”.

The fracas, which will fuel fresh fears over Westminster’s drinking culture, erupted at about 10pm on Wednesday.

A witness in the 145-year-old bar - where Winston Churchill used to drink and which stands in the shadow of the Elizabeth Tower housing Big Ben - told the Mirror: “I was passing by and I saw a man jump from his seat.

“He looked scared and I asked him, ‘Are you OK?’

“He said, ‘She’s attacking me!’

“I went to the woman and I said, ‘What’s up? Are you OK? What’s happening?”

The anti-Brexit campaigner, who it is thought had an EU flag, allegedly pointed to Mr Offord and said: “That Tory tw*t.”

Conservative sources said Mr Offord had begun to film the woman with his phone because she was being “verbally abusive” - and she then “physically assaulted him”.

Mr Offord apparently suffered a cut near his nose, but he refused bar staff’s offers to call the police.

The MP, who sits on the Commons Environmental Audit Committee, allegedly told a witness: “That woman is crazy.”

Staff at the popular watering hole kicked the woman out of the bar, telling her: “Move, just finish your wine.”

The pair had earlier been seen speaking on the pub’s green leather seats, and were described as having a “friendly conversation”.

But a witness believed that when their chat turned to politics, it became apparent they had “different opinions” - triggering a quick souring of the atmosphere before it turned physical.

A source in the pub said that while Mr Offord had been drinking, he did not appear to be drunk.

A woman who witnessed the aftermath, Leyla Sanai, tweeted Mr Offord to say: “Hope your face has stopped bleeding. Saw you being attacked in pub in Westminster few hrs ago. Shocking.”

Mr Offord hit the headlines in May 2016 after he allegedly hurled abuse and made explicit gestures at passing Labour campaigners .

He was accused of half clambering out of his constituency office window to make rude gestures at a decommissioned fire engine carrying a Labour politician and a retired fire officer on the day of local elections.

Mr Offord declined to comment last night.