Hi John,
It used to belong to Stuart Harvey in Norwich, a long time club member and Dedra owner, he sold it and bought Alan Cooper's 2nd series Delta LHD HPE Turbo, although I lost track after he sold that, and I'm not sure if he's still a LMC Member.
I agree with Frank that it would be worth your while to join TDC, I'm also still the Dedra Technical Adviser, although not much call for my help these days! but I still have all my manuals, including most of the common to all models stuff on CD, and I'd be happy to burn you a copy.
Although I never managed to get hold of a Dedra Turbo Manual a lot of it was common with the Dedra integrale 4x4 LHD which never was officially imported here, although Chris Hopkins has a very nice example, so a good source of advice, but I do have a copy of the Dedra integrale 4x4 manual in Italian!
Good luck.
Brian