Hi Bumble
Your first port of call should be Asperger East Anglia www.asperger.org.uk. They have been successful in arranging adult diagnosis.
They also run social groups in Norfolk and Suffolk; you don't need an actual diagnosis to attend the groups, but should email or phone them before attending one for the first time. We're all quite tolerant of people who are not sure if they have AS or not, and the groups always have a support worker or two available, so don't worry about that.
They were a great help to me (I volunteer for them, too) as I was diagnosed by a GP in my early 40s six years ago but couldn't get a formal diagnostic assessment because Suffolk NHS wouldn't fund adult diagnosis at the time. In Norfolk, you have a good chance of getting an assessment.
EDIT: Their website seems down at the moment, so their phone number is 01603 620500.
Hope this helps.