It would have been supplied and serviced by Grange at Exeter. Get in touch with their service manager Paul Easton 01392 678044 paul.easton@grange.co.uk
Done some serious research in to this cars history - it's currently for sale on autotrader (in Harlow). If anyone is interested in it please pm me and I'll fill you in on what I've found. (I won't be bothering to view it)