But, as under the law in England and Wales, rape is a crime committed with a penis….. so these (alleged) rapists are “bodies with penises” being recorded as women in crime stats. So transwomen, right?
You can't necessarily conclude that purely from the letter of the law.
For whatever reason, in the 2000s (I think) there was a drive to make the law sex-neutral here. But it appears they decided it was easier to have that effect by changing sentencing guidelines than the law itself.
So the guidelines say that for all practical purposes any form of "sexual assault by penetration" is sentenced the same as rape ("sexual assault by penis"), and the two are grouped together in the stats, despite "rape" still being a different offense.
If you look at the small print for the "rape" stats, you'll probably see that it encompasses offense codes 14 ("rape") and 21D ("sexual assault - penetration"). (Not sure of the code numbers - that's just an illustrative example. I've looked at this in the past, so recall how it worked).
HOWEVER, yes, given male/female offending behaviour it seems likely to me that a large number of those recorded for rape/penetration will be transwomen, most of the rest will be female accomplices, and there will be very few female perpetrators. But I don't know that we can see the data to be certain.