I have just come across a CADC brochure "PDMS Technical Information Booklet", which I think was produced for the Achema (sp?) exhibition in Frankfurt in June 1976; a Pr1me product bulletin "Plant Design Management System" date 5/83; and a Compeda leaflet "5. Data Interface" describing the interface to Compaid. There's also a bit of memorablilia from the very first customer training course, given to people from George Wimpey in November 1976.
I'd let them go to a formal archive, or would scan for on-line posting if this forum has the facility to keep the scans.
Somewhere (TM) I've got a lot more from that era, but it hasn't surfaced for quite a while....