Supporters of the Women's Equality Party have been left "enraged" after candidate Sophie Walker was not invited to take part in a Mayoral hustings event.
The hustings, organised by LGBT organisation Pride In London, are due to take place tomorrow.
The sold out event will hear from mayoral candidates Sian Berry of the Green Party, Conservative Zac Goldsmith, Labour candidate Sadiq Khan, Caroline Pidgeon from the Liberal Democrats, and Peter Whittle of UKIP.
It is understood that Pride in London chose to invite the five candidates to the hustings event based on their parties' performance at the last general election.
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However, the Women's Equality Party has questioned the fairness of this decision, as the party was not formed until after May's election.
Broadcaster and WEP co-founder Sandi Toksvig told PinkNews: "The party didn't exist, so it's not a very sensible way to decide to proceed. Especially when it is the fastest growing political party in the country and we have been asked to all the other hustings.
"I've rarely been more enraged in a very long time. I like to think that the LGBT community is better when it stands together and in this instance I think the women have been done a disservice.
"Lesbians are doubly disadvantaged because we're gay and we're female. It's time somebody stood up and understood that."
Ms Toksvig added that she was upset and angered by the decision as “the one place that ought to understand about the need for equality and diversity is within the LGBT community.”
She also tweeted to say that with 45,000 members, the Women's Equality Party is almost as big as UKIP - one of the parties which is represented at the event, which has 47,000 members.
Pride In London did not respond to The Evening Standard's request for comment.
However, a statement on the event page for the hustings reads: “We selected representatives of the five political parties with proven representation in London – the same rationale as used by the BBC for their recent 1-2-1 interviews.
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"Given the large number of candidates contesting this election, we felt the need to limit the panel in this manner to ensure a dynamic event with a high level of engagement with the audience and the candidates in attendance.”