Hi Paul,
If you are in the UK, I can recommend you to contact/join the Matra Enthusiast Club, where you probably can get more help locating information - especially from Roy Gillard (London) who also used to be a truck mechanic, but for the last 5-6 years has been 100% Renault Espace mechanic.
Club contact is here:
http://www.matrasport.dk/pointers.html#clubs/Lennart