Last week's landmark ruling on trans women in Britain will not impact Sunday's London Marathon, with race director Hugh Brasher saying he supports a recent World Athletics decision to gender test to "protect women's rights to compete fairly".
Brasher added he will wait for guidance from the Equality and Human Rights Commission (EHRC) and Sport England before deciding if changes are needed for future editions of the London Marathon, which currently permits runners in the mass race to self-identify their gender, but restricts entries in the elite and championship races to females at birth.
Last week's much-anticipated ruling said only biological and not trans women meet the definition of a woman under equality laws, a decision that confirms that single-sex services for women such as sports can exclude trans women.
"It's really difficult to predict what we would do," Brasher said on a call with media on Wednesday.
"I've gone through loads of different scenario planning since the court delivered its verdict, but honestly, we have to wait until the commission gives its report, until Sport England do, because otherwise we're just going on to what ifs, what ifs, what ifs.
"We delight in being both inclusive but also protecting in competition the rights of women, which is incredibly important. Seb Coe and World Athletics have always led on that, and we absolutely look to continue doing that."
World Athletics president Coe announced last month that female athletes will soon have to undergo a one-time genetic test to compete in women's events, which has been met with criticism.
"I think that what World Athletics have done has been incredibly good for athletics and been really clear," Brasher said. "When you look at the Olympics, you're looking at protecting women's competitive sport, I think it's absolutely vital. The job that Seb Coe has done has put the sport at the forefront of protecting women's rights to compete fairly."
Asked how many trans athletes are entered in Sunday's marathon, Brasher said it is impossible to know, since it is self-selection.
"Your passport would say your gender, and your gender can say female, even if you were born male. And so this is where getting into the advice that there is going to be from the Equality and Human Rights Commission and Sport England is incredibly important," he said.
"This is complex. We're really clear about the competition element, anywhere where there is competition that includes 'good for age,' that has to be your biological birth sex."
Sunday's race is expected to feature more than 56,000 finishers, which would be a Guinness World Record, and will feature all four Olympic and Paralympic champions -- Tamirat Tola and Sifan Hassan, and Marcel Hug and Catherine Debrunner.
Others worth watching are Jacob Kiplimo who recently smashed the men's world half-marathon record and will make his debut in the 42.195-kilometre distance on Sunday, and four-time London winner Eliud Kipchoge, considered the greatest marathon runner of all-time.
Britain's Alex Ye, the 2024 Olympic triathlon champion, and Commonwealth Games 10,000-metres champion Eilish McColgan will make their marathon debuts.
"People just have to look at themselves as to why on earth are they doing that," he said. "How she has held herself and responded to that is exemplary. There are some social media channels that are particularly vitriolic and descending into a gutter."
Brasher said the London Marathon has stopped posting on X, the media platform recently known as Twitter. Their last post was January 17.
"Just looking at how that channel, the vitriol, it was ceasing to be a rational conversation, it was ceasing to be a positive place to be," he said. "The London Marathon is about positivity."
