I dont think you can expect an outfit like "we buy any car" to but something that to the Motor trade is as obscure and specialis as a Morgan. Thei business model is based on buying standard cars for which there is an established market price and then selling them on for a small margin at auction.
I think Phil's point is that a company calling itself "We Buy Any Car" ought to buy any car.
If their business model prevents them from meeting that, not unreasonable, expectation then they should change their name.