on the Hyundai Affinity scheme you can get a top of the range i10 for £12950
Only certain groups qualify for Affinity.
Carwow are good, but you need to check the dealers yourself, I picked a bad one!
Plenty of other online discount brokers - beware of those who want money - with a good broker, they get their money from the dealer so the customer only has to deal with the dealer.
Many of the brokers can only access retail dealers, those with access to fleet dealers can give better deals - but that varies by brand.
Whether it's Affinity or a broker, don't expect more than bottom book for the part-exchange - check out WeBuyAnyCar as they can be better in those conditions - BUT - if you p/x is less than perfect, they will mark it down on examination - but not unreasonably so.