And yet transmen can't legally inherit titles and even those with GRC and a reissued birth certificate can be excluded from single sex spaces when considered appropriate. So self ID in the UK isn't really actual self ID for all purposes.
I'm not sure there is a contention right on inheriting titles. I don't happen to agree with titles, so I'd be inclined to scrap them, but that shouldn't happen on my say so.
Single-sex spaces? Yes can be excluded not just merely when considered 'appropriate' since it must not be a casual process or exercised on some whim, or somebody outside of the management of the organisation. It must be a carefully considered justification as a departure from statute, others is could result in being found unlawful.
Self-Id isn't part of the law in the UK. It doesn't happen. This is despite two select committee panels meeting with all interested parties and making recommendation to government that Self-ID ought be the way forward for the UK. Theresa May accepted the finding but was swiftly booted over Brexit rows before having the chance to implement it. Then we got Johnson.
As we don't have a system of self-Id, we have an outdated invasive and intrusive medicalised system based on an outmoded notion of gender dysphoria being a diagnosable disease. Trans people are experiencing the same kind of regressive attitudes and policies as women's rights did during the struggles. I actually burnt my bra and haven't worn one since - please nobody ask for evidence!
In the UK gender recognition achieved a number of things. Firstly it recognised that the right to marry should not rely on the biological sex alone of the partners. This was 2004, so nine years before same sex marriage became law. Accordingly when the explanatory notes arrived for the earliest recognition of gender between 2006 and 2013, they said that from that day that a trans woman (with a GRC) could only marry a man (biological or trans man with a GRC), and not a woman who is either cis or trans (with a GRC). Since 2013 it has not needed to say such a thing.
The process of gender recognition is purely administrative. It relies on a minimum transition period of two years before application can be made. The evidence is based on socialisation into role. Oddly it requires medical professionals to be the arbiters of that achievement. The 'diagnosis' part is simply a record of the person saying consistently, my self knowledge is that my gender identity is not congruent with my sex. These two parts become the submission. In practice, all that gender recognition achieves is the right to amend the record of birth, and the record of their death - which actually has no detrimental effect on anyone. There is also some stuff about tax and pensions, but nothing of interest to this discussion.
The Scottish Act was not instant Self-Id since it reduced the waiting time from 2 years to 6 months. As an opinion I think that is quite reasonable. In other countries the process can be much shorter. I've stated my own views before. I happen to think that the medical diagnosis part is unnecessary, and should be done away with. I also happen to think a reduction to 6 months is a sensible compromise. I also happen to think that people (not just women) should be able to see that the system is safe. My own preference, and not opposed by any of the trans people I happen to know is that, in place of the medical diagnosis should be a criminal background check, just as if applying for a job, and those people who have a criminal record of sexual or physical violence should be monitored over a longer period and include a form of risk assessment. This is but an opinion, and other people as always are free to have their own opinions.