Wheeler dealers have never had a Vauxhall on the show for some reason.
Its nothing to do with like and don't like, its purely down to the fact Vauxhall have never made a truly iconic car.
Ask the general public and they will go through all number of Cosworth/ Lotus/ XR/ RS branded Fords, Mini's, Italian sports cars, Japanese turbo'd saloons even Swedish estates before very very few will mention the Lotus Carlton or Big Bertha, the only two half stand out cars, neither of which can be bought for sensible money and change hands with any regularity.
Even the VX220 turbo, a fantastic car, never had a Vauxhall written anywhere on it
I bet there's more people that have never even heard of a Cavalier turbo than have
Hence why make a program about a car no one gives a toss about either in Europe or the USA where the programs are made