I've been following the hearing live, and that's a pretty decent summary as far as it goes.
What is missing is the account of the murky procedural shenanigans, which I don't think we've got to the bottom of yet. Upton was creepily making a "contemporaneous note" on his phone every time Mrs Peggie did something he felt was a slight. The first two occasions were simply her leaving the changing room when he entered and waiting outside till he'd finished. The incident late on Christmas Eve was the third in the changing rooms, and on this occasion Mrs Peggie was in a bit of a state due to a sudden menstrual flood, and needed to change herself right down to her undies, urgently. When she went into the changing room Upton was there. She asked him to leave and he refused, saying that he had as much right to be there as she had.
Note, if it had been another woman in the changing room, rather than creepy Upton, that other woman would have asked discreetly if Sandie was OK and if there was anything she could do, and then left the room as requested. Upton's behaviour patterns are anything but feminine.
Upton freaked out about this and submitted a complaint about Sandie's behaviour at 3.30 am on Christmas morning. All documented on his phone, along with a couple of occasions while they were working together when he took offence because she hadn't made eye contact with him. As an aside, I wonder how many other female employees working around Upton are now concerned that he has a list on his phone of times they did something that hurt his feelings. This is all about his need to feel safe. What did he think the 5' 6" Sandie was going to do to him? He's six feet two (although he only admitted to being six feet at the tribunal) and had arm muscles like a stevedore's. (He doesn't feel safe in the men's changing room, by they way.) Indeed, he considered reporting Sandie to the police over this "misgendering". It doesn't seem to matter if women feel unsafe though.
There was some sort of investigation into this, and it appears to have petered out without anything much happening. The documentation referring to this was not disclosed by the respondents, and Sandie's advocate realising this and applying for the missing documentation is part of what has caused the hearing to drag on so long. (Upton's rambling responses, continually objecting to counsel's choice of words and affecting not to understand, is another, and also his own counsel keeps interrupting and objecting which takes a lot of time.) Following that, Upton started to put together a much more serious set of complaints. These related to a couple of incidents he said occurred in the emergency room itself, where he alleged that Sandie had put patients at risk by refusing to work with him. However, he didn't report these at once, even though he is professionally required to act immediately if he sees a patient at risk. No contemporaneous notes, not even exact dates. He seemed to be being as vague as possible to make it difficult or impossible to find other staff members who could corroborate (or contradict) his account. He spent weeks in correspondence with the BMA trying to find out how he should complain about Sandie without exposing himself to jeopardy for being rumbled as making a false complaint.
It was as a result of this second set of complaints that Sandie was suspended from her job. Upton seems to have been believed without question, and the handling of the whole thing is extraordinarily murky. A highly pejorative email was sent to all staff, and the writer of that email has just been added to the list of respondents. The impression left is that Upton is highly manipulative and when his first attempt at getting Sandie into trouble seemed to be petering out, he decided to go for her with complaints that she put patients in danger. (The incident in the emergency room which has been dated turned out to have happened on 31st October, but Upton did nothing at the time, only making a complaint in January or February after much correspondence with the BMA apparently geared to protecting his own backside. In contrast, the complaint about the misgendering and lack of respect went in on Christmas morning - actually in the middle of the night - mere hours after the event.)
Amusingly, someone set up a crowdfunder page in order to "Let's show Dr Beth some love and support and raise some money so she can treat herself when this is all done!" The target was £500 and it's currently sitting at £1,847. Nice. (Although there are rather a lot of £1 donations from people with names like "Dr Fanny Baws".) About 30 hours later someone else set up an identical fundraiser for Sandie Peggie, again with the target of £500. It's currently sitting at £21,697.
ETA: The more I think about it, the weirder it is. Upton was in the habit of making contemporaneous notes on his phone if Sandie so much as looked at him funny - or didn't look at him, as the case may have been. He wanted to document it all in case it "escalated". But when he apparently saw her, twice, do things that he believed put a patient at risk, he made no notes, alerted nobody, and when he finally submitted a complaint months later he couldn't date the incidents to better than within a couple of months.