The first photo (DFC sponsorship) was taken by my father. The black & white photos are credited. The shots from 1990 didn't have photo credits.
It could be worth contacting Graham Blow or Euan Cameron (both from www.sportpromedia.com) or Geoff Ridder (MotorsPortraits) as they were photographing at the time your car was being raced and are still in business today.
Malcolm