Hi, I was moved to write this after reading comments from people finding it hard to access adult asd diagnosis services.
I'm a student mental health nurse, who also happens to have aspergers syndrome. I was only diagnosed two and a half years ago. It has changed my life for the better, although I hasten to add that diagnosis doesn't help everyone, and that it's a difficult journey.
If you feel that you have traits, there is more than one way to access diagnostic services. Some people go through their g.p. However, if you feel this is not for you, or you have felt that they didn't listen or help, self refer to your local well-being service. Certainly in my area, they cover access to the Autism diagnosis service. You will have to deal with several assessments, which can be upsetting, and you may have a long wait. I had to wait a year from first contact to diagnosis.
I'd also like to say that the law demands a diagnostic service exists in every area in the u.k, so there will be one. They are contactable and can be found online if you need to and can give advice. Unfortunately the downside to adult diagnosis is that there is no support to help you deal with it. Nothing. There are charities but they are overwhelmingly for children. You also may not get the answer you wanted or were expecting, this can be hard to deal with, but it isn't a negative. It means that you've ruled out one possibility and can now go down the next path towards getting an answer.
However, if you feel that a diagnosis will help you make sense of your life, persevere. You'll get there.