Vauxhall used to have the best test drive deal but I believe it’s ended now. You woukd phone their motability hotline tell them what you were after and they’d bring you the closest to what they had for 3 days and then pick it up afterwards.
Over the years the MiL had several 3 day loaners which were so handy being 30 miles from the dealers plus because you weren’t dealing with sakes there was never any pressure.
Good luck with test drives everyone