I contacted Compair today and they were very helpful and have emailed me PDFs of the manual and the parts manual via their local supplier to me. Very good service!
Apparently it is a 2000 series compressor. The one in the title is just what I found on other adverts in google searches. The one I have is the 2085HT in the manual. I think the 2085H is the motor and pistons, but no receiver from what I can make out.
Manuals and parts diagrams are attached in case they are of use to anyone else.