A woman has a vagina and a man has a penis

Sir Keir Starmer initially struggled with the question, before stating last year that 99.9 per cent of women “haven’t got a penis”.

Rosie Duffield, Labour MP for Canterbury, has faced a backlash for her views on transgender issues, including that “only women have a cervix”.

Ms Duffield was cleared by party bosses in January after a year-long investigation into transphobia allegations.

On Sunday, Lord Cashman, a former EastEnders actor and Labour MEP, apologised after tweeting that Ms Duffield was “frit or lazy” for cancelling hustings.

Ms Duffield said she was left with no choice but to cancel after “constant trolling, spite and misrepresentation” from some had affected her “sense of security and wellbeing”.

Labour also supported Nicola Sturgeon’s controversial self-ID reforms in Scotland, which would have allowed people to change their legal gender by simply signing a statutory declaration.

Rishi Sunak’s Government blocked the plans over concerns they undermined UK-wide protections for women, including the sanctity of female-only safe spaces.

Sir Keir had pledged to introduce a similar system but last year declared that a woman is an “adult female” and he did not believe that the self-ID policy was “the right way forward”.

He said that Labour had had the “chance to reflect” on what happened in Scotland, where there was a public outcry over trans rapist Isla Bryson being sent initially to a women’s prison.

The Tories have made a general election pledge to transfer responsibility for creating new gender recognition laws in Scotland from Holyrood to Westminster, thereby preventing the SNP from trying to reintroduce self-ID.

Anas Sarwar, the Scottish Labour leader, opposed the plan and said a Keir Starmer government would instead issue “appropriate guidance on single-sex spaces based on biological sex”.