I hope what we'll get at the end of all this is not just clarification, but confirmation that if you don't want to use the changing room appropriate to your sex, then you use a gender neutral one. That's your alternative. Not the opposite sex changing room.
But I don't think this was ever about being scared in the men's. It's not about a third neutral option being unavailable (because if there was a alternative for SP, there was bleeping well an alternative for Upton.)
It is about being in the female changing room. It has always been about that. He wanted to use the female changing room and so that's what he did. He did this knowing that it would upset female staff. We know this, because he was on the lookout for signs that they were upset. He kept a diary to prove it.
The NHS changing room policy is 'anyone can use any changing room they like' (when you take away the nonsense and put it in language that a five year old can understand). We've been given a million excuses to justify it - 'feels' like the opposite sex, harmful to mental health if not allowed access to the opposite sex changing room, 'scared' in the correct changing room but no proof of this needed, no-one can tell what sex anyone is anyway, if you notice that someone is in the opposite sex changing room you've the pervert for noticing etc etc. But all they're doing is trying to say that it's not what it looks like.