Following on from Andrew Marr asking this to Jeremy Corbyn, I thought JC's response was a little embarrassed. But Andrew Marr could have done so much more with the follow ups! Perhaps we could start a list of decent questions to follow up?
I would start with 'just to be clear, you believe someone who was born a man, and has not undergone any surgery or hormone treatment, and who still retains his full male genitals, is a woman?'
I think this is a really necessary follow up because I bet at least 50% of the population couldn't tell you whether the word 'transwoman' means 'born a man, wants to be a woman, or vice versa'
And then I would follow up with a line of questioning that would reveal whether he wanted someone who believed that 'woman' was a matter of biology should be prosecuted or disciplined for that.
So many roads to go down!