Two election frontrunners have refused to say what a woman is.

Both Clive Lewis and Jamie Osborn, who are standing for Labour and the Greens respectively in Norwich South, declined to answer the question, which has become a significant issue in their constituency.

Among those also standing there is Linda Law, from the Party of Women, a political group which is concerned about the protection of women's spaces, such as in hospitals, changing rooms and in sport.

The group - which organised a protest in the constituency earlier this month - believes such spaces are threatened by gender identity ideology, which promotes the idea that men who identify as women should also be allowed access to them.Linda Law launched her campaign at a protest in NorwichLinda Law launched her campaign at a protest in Norwich (Image: Kellie-Jay Keen)

For this reason, candidates' views on sex-based rights, gender identity and how they define a woman have come under scrutiny.

Jamie Osborn refused to give his own definition of a woman and instead responded with a statement about trans people.

He said: "The way that trans people's lives are discussed too often glosses over the fact that these are real people, with their hopes and dreams and struggles.

"No matter people's personal views, the facts are clear that trans people face some of the biggest challenges in getting access to healthcare, housing, and breaking through discrimination.

"Trans and non-binary people absolutely deserve support at all stages, which the Green Party is proud to stand for.

"The Green Party supports the right of trans women to be legally recognised as women, and likewise for trans men and non binary people."

READ MORE: Former Clive Lewis staffer endorses Jamie Osborn in Norwich

Clive Lewis also declined to give his own definition of what a woman is.

He has previously faced criticism from women's groups after he publicly supported transwomen breastfeeding babies.

Responding to backlash to his comments online, Mr Lewis said: "100pc proud to support this. That's the best you've got? Bring it..."

Polls suggest the men are the frontrunners in their constituency, with Mr Lewis predicted to win.

The other candidates are Sean Bennett for the Lib Dems, Graham Burton for Reform UK, Conservative David Thomas and independent candidate Elizabeth Davey.