It would be interesting to have more information about that.
So i'm wondering what the options were for gender on the BOE survey, and whether they simply counted anything other than male/female as being transgender?
There are still many businesses who only list two gender options.
It's like with coronavirus testing, if you test one town and don't test the other, does that mean the 2nd town is completely clean?
If they're not looking for anything other than male/female, then anyone else would hidden within the statistics.