Here is a BBC article about transgenderism in sport - with Rachel McKinnon stating that men have no biological advantages over women.
www.bbc.co.uk/sport/46453958
The article states:
"It is difficult to measure numbers accurately, but government figures suggest there are 200,000 to 500,000 transgender people in the UK, equating to 0.3%-0.75% of the population".
And yet. Here's BBC's own Equality Information Report from 2018.
Stating that 2.8% of the BBC's senior management team identify as transgender.
downloads.bbc.co.uk/diversity/pdf/bbc-equality-information-report-2017-18.pdf