Hi J
I'm in London too! Okay so to give you more specific advice I would have to know which PCT you are in, which is usually the same as your borough (I think).
The most popular diagnostic tool in the NHS is the DISCO method, which is not a questionnaire type. Also if you want to access some NHS services, they won't accept a non-NHS diagnosis (sigh). So please find out about this before you pay for a private one.
I personally think the DISCO method has a lot of advantages, in that there is room to take more of a history, rather than just tick boxes. Especially if the question isn't phrased in a way that "clicks" for you, you could still exhibit the trait, but you wouldn't get the points. I hope that sentence makes sense.
I read the thing about 12-18 months to get diagnosed as well, but that is about waiting list times, not the actual length of the procedure, and I don't know how true it is. My guess is it would be hard to get in done in less than 6 weeks.
First things, first. What kind of relationship do you have with your GP? The GP is of course the gateway to all other services, so if you don't feel you can talk to your GP, ask neighbours for a recommendation of a good one. Or if you are in a large practice you can see anyone, not just your named GP. So try to find the one that you trust the most. When you go to discuss Asperger's don't go to see them for any other reason. So no long lists of illnesses and then try and fit it in at the end
I know the men in my family don't like going to the Dr, so they try and fit everything in one visit, that they've been suffering from for 10yrs
The alternative route is if you have some kind of contact with Mental Health services through the CMHT (Community Mental Health Team). If you do, I'll explain that route in a separate post.
Also if there is something you don't want on the forum/in public you can PM me.