I drive for a living, and even I can't get a courtesy car from any SEAT dealer. For some reason all their insurance policies are only insuring 25 and over. I offer to get them insured through my own insurance but they say they won't let me.
Never had this problem with Vauxhall. Walked in, swapped keys, walked out. I owned that car from 18-21.
Perks of being 27 years old chap