Afraid I've come rather late to this thread and have read some but not all posts. Very interesting thread, imo with some very well informed points being put.
The article by Rachel Johnson made a lot of sense to me. I heard a discussion on R4 a while ago where one of the guests was a psychologist. In his opinion, many (if not all) transgender issues had a psychological rather than a physiological base.
I'm inclined to agree. For one thing, bodily mutilation is so extreme as to be unthinkable for most people. Secondly, it appears that many who have been through this process are still not happy.
And thirdly, many men who 'become' women (in whatever guise), still seem to prefer female sexual partners. So to all intents and purposes, they are true to their birth gender.
Maybe we should be free to accept whatever gender a person wishes to display at whatever stage in their lives. I'm thinking this is a spectrum which everyone is on, somewhere. Maybe the position on that spectrum can change depending on circumstance. There will always be extremes at either end, but a lot of people are somewhere in the middle, inclining to one end or the other most of the time.
Doesn't answer the ladies loos issue, though....