I hope I don't offend anyone by saying that, in my view, this is one of the most ill-advised proposals the UK government has come up with in recent times. Gender transition is a serious business but to reduce it to a box ticking exercise just seems to demean the trans community.
The thing is that gender has two facets - one's inner feeling and one's interaction with the wider community. We have all, to a greater or lesser degree struggled with our inner feelings; some go down the transition path, some live with the struggle but that is very much a personal decision. However, we also interact with the wider community which, for reasons of decency and security, still largely segregates individuals between male and female. Agreed, the vast majority would respect this legislation for what it is and use it only as an enabler in their journey across the genders.
However, think about this scenario - a male with no history of dysphoria commits murder and then before being arrested & tried self elects to become female. Found guilty and given a prison sentence then states that it is 'her' human right to be sent to a women's prison. Do the judges turn the request down (which effectively goes against the legislation) or comply and send someone who is, to all intents and purposes still male, to a women's prison? Obviously the latter as that's what British judges do. So we've now got a load of cis-female inmates at risk; easily solved - place our newly transitioned prisoner into isolation but, of course, this goes against their human rights! 'Would never happen' I hear you say but this is the country that can't deport convicted criminals because it would violate their human rights and, guess what, they carry on offending.
The struggle that genuine transgender individuals have to endure is heartbreaking and anything that reduces the distress has to be a step forward but, equally, there has to be a limit.