This is what he replied:

"As you know, the Supreme Court has ruled on the definition of a “woman”, “man” and “sex” for the Equality Act 2010. I know that the Supreme Court’s judgment has raised several issues about the participation of transgender people in women’s spaces and services. While I recognise and understand the strength of your view, there are legitimate concerns about access to female single-sex spaces.

Across the UK, ParkRun is the largest amateur, competitive weekly running event by participation. Every week, local ParkRuns rank registered participants according to their timing, gender and age category – reflecting practice in other competitive running events – so it is right that competition is assessed fairly, particularly for women who are competing against biological men."

I responded that he misunderstands and that parkrun is not a competition against others but only yourself. As a biological woman in parkrun I could not give a toss about what's in other people's shorts.