I have unchosen sexual issues and i have the same problems. Like you, i live in S. UK and have family to visit in S. Spain

Help with sexual issues have been forgotten and totally pushed to one side in order to make room for child protection strategies. If you have a problem with your sexuality and are in desperate need of therapy, you'll find none if you are seen as a risk to public. Strange that is, to provide no help for those who most need it. This is true of the UK today. NHS and Government do nothing about it, and most qualified therapists and psychiatrists dont want to know if there is a possible criminal element to your issues. Its a disgrace upon our nation for having let things get to this stage. You are spot on, it really does feel, that people who could develope serious psychological problems through sexual matters, actually are completely ignored and are left to deal with it ON THEIR OWN! Makes me so bloody angry....
All i can suggest is, that you keep looking up private therapists and other mental health professionals and ask around within those organisations. Most wont want to help you, as it could complicate their lives. In my opinion, they shouldnt be doing that job. Some real people with real hearts will also be working in the mental health profession, you've just got to find them. When you have found "the one" that actually wants to help you, and you are successful in letting out some of those head gremlins allowing you to focus more on life, then perhaps you can document and broadcast your story on how the NHS were happy to let you rot. Dont be paying silly money, nobody can guarantee their work so much to charge such rates. £50 per session is quite enough i think.
Anyhow, keep your head up and try focus on something else for a while. Lately, i found mental healing in taking an interest in the universe. There has been a string of programs lately and there is alot of discoveries being made. Planets of 100% oceans, planets where it rains methane and even planets where it rains iron! No joke! It kind of helps put things into perspective. It allows you to look at your own life where your problems can almost vanish. To attempt at seeing the bigger picture is something of real importance, unfortunately humans like to fight over the very small things whilst oblivious to the fact that its a miracle that everyone of us is on this planet. Our star (the sun) is half-way through its life cycle. Way before 5 billion years time, we will all be history, just once again floating around in space and time waiting for the next event. Im not saying i believe in life after death, but when you start learning about what else is going on outside a tiny planet, it opens the doors to those beliefs. Our sun gave us life, and it will taketh. Dont let the bastards grind you down. They know nothing...really
Good luck to you, and at least have a look outide earth, oneday we will actually be able to do that

Dont waste your time playing the suffering victim, because its those bastards that are putting you there. Stuff them.