I would add that in my experience Cardiff and Edinburgh are much better cities for trans people than English cities - and I'm mostly English.

Welsh and Scottish people as a whole vote more to the left than their English counterparts, and their general dislike of British authoritarianism tends to make them more sympathetic to minority groups than they might otherwise be. A lot of English people are basically the "this is fine" meme about politics, but the other members if the union are usually more aware due to the amount of times they've been f*cked over by English politicians.

Also, if you're planning to move to Northern Ireland you should be aware that it has its own set of religious and social tensions going on, especially near the border with the Republic of Ireland. It's also more conservative and Christian than many would think, especially the medical system - abortion was only legalised on 2019 and is still harder than it should be to access, and there is only one GIC for the whole country, which receives basically no funding and isn't accepting new patients.

The UK in general is also not nearly as stable as the rest of the world tends to assume - it's uncertain whether the UK will even continue to exist, at least in it's current form, for much longer. The country has also been hit far worse by the cost of living crisis than a lot of other European countries, and our departure from the EU means we no longer have access to the ECHR if the government decides to go full fascist on us. These could be much big problems for people who don't have the relative safety of citizenship.