I was diagnosed in the UK under the NHS 3 months ago. As in your case, there was little followup. The psychologist was really sorry about that, but she explained me that they were no local services specialized in care for autistic adults, so all she could do was refer me to the general mental health services (where I could also self-refer on my own anyway if I wanted).
However, I did get an official report by physical mail a few weeks later. It is a 4 pages document, 80% of it is just a rather boring summary of what went on and was discussed during the assessment sessions, the end is more interesting and details the professional opinion of the psychologist and the differential diagnosis. Globally it didn't provide me with any information I didn't found out either on my own or with the psychologist during the assessment sessions, but it is an official 4 pages document by an NHS psychologist saying I am diagnosed with Aspergers.
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ouroboros
A bit obsessed with vocabulary, semantics and using the right words. Sorry if it is a concern. It's the way I think, I am not hair-splitting or attacking you.