https://old.reddit.com/r/stupidpol/comments/1qgrl0f/59_of_trans_women_imprisoned_in_the_uk_were/
A parliamentary written submission that compiled UK prison data found that 76 out of 129 trans women prisoners (approximately 58.9 %) were serving sentences for sexual offences when the report was written.
A much higher share than for other prisoners. For comparison, only about 3.3 % of the general female prison population were sex offenders, and around 16.8 % of male prisoners were sex offenders in the same dataset.
These are probably better examined on a case-by-case basis, especially with a low sample size like that.
I definitely would look deeper into the data to draw any conclusions. It is the BBC’s sacred duty to endanger as many transgender people as possible, and so I have every expectation that it’s biased against the trans community.