Gosh, Feminist4, talk about an own goal.
The BBC fact check article confirmed FPFW's figures (gleaned from FOI requests and carefully going through the published prison stats), rather than debunking them. All the BBC were able to do was to leave out the crucial bit of context that 98% of sexual offenders in prison in the UK are in the male estate.
For 2017, there were 120 prisoners in the female estate due to having committed sexual offences. If trans people are 1% of the population (the figure Stonewall and others have suggested), one would expect 1 or 2 to be transwomen. FPFW put the number of prisoners identifying as transwomen in the male estate at 48 (somewhat lower than the figure in the BBC article, though I suppose it's possible that some of the "60, we don't know what gender" could be in the women's estate - though trust me on this one, this is only going to make the maths look even worse for the transgenderist side of the argument).
So, if we took all of those transwomen and placed them in the women's estate, we'd now have 48 out of 168 women sex offenders (on the much vaunted TWAW definition of womanhood) being transwomen, i.e. 28%. Instead of 1%. That's one hell of a jump.
With numbers like that, Feminist4, I wouldn't be drawing attention to that BBC article if I were you. I'd be putting it in the proverbial locked filing cabinet in a dark cellar down a broken staircase with a beware of the leopard sign on it.
And as Lang says, it wasn't gender critical feminists who did this to the stats. It was Stonewall's relentless push for self ID and a "trans" umbrella that encompassed fetishistic cross dressers. I'd be much more amenable to the "no true trans" argument if people said "you know what, we want to limit 'being trans' to people with genuine gender dysphoria - and the Karen Whites, Davina Ayrtons, Lisa Hauxwells of this world are not true trans, they're male fetishists opportunistically trying to pretend to be something they're not".
But by insisting "trans" is "anyone who says they are", I'm afraid you've sawn off the branch you're sitting on.