I had an entry for Dijon, and having had a great time there with my Scott last year, was sorry not to do it again. Unfortunately a rogue car driver had other ideas, about 5 weeks ago, and both my TT Rep and my right arm are now rather mangled. I shall certainly enter again next year.
I think I am right in saying that there are some Scotts out there which have been converted to run on petroil and it is likely that the Scott you saw was running such a conversion. There is quite a lot of work involved and it has been written up in old copies of “Yowl” (the club magazine). Undoubtedly details appear in Technicalities, now available on CD thanks to Steven Enticott.
Good luck with your Scott purchase!