I just did some maths based on the last line of that article that currently 1 in 50 male prisoners in the UK are claiming to be women
So UK prison population (from Wiki)
Male - 79,749
Female - 3,869
1 in 50 of 79,749 is 1,594
1,594 is close to half of 3,869 (slightly less than)
If gender identity in prisons goes full steam, the women's prison population would increase by half. Approximately 1 in 3 would be male.
Even if 1 in 4 are male that's unbelievable.