When dropping off our "new" MK6 at the dealership for some remedial work last week, it was parked next to a MK7 GTi. They both looked really good and taking into account the cost difference/ the deal we got, I felt pretty well chuffed with ours and did not for one minute feel like the poor relation.
I've never PX'd a car and always sell privately. An immaculate and properly service/maintained, desirable type of car will sell quickly via Autotrader/ elsewhere within a few weeks if priced and advertised well/ correctly, whether that is £2k or £20k, fact.
Dealers definitely want to sell you a car on Finance as opposed to just taking your cash because with said GTi, despite getting an excellent deal "for cash", right til the death they pushed me hard to take Finance which they said would get me a further £500 reduction plus 2 years free servicing... And they said I could pay the Financed amount off within 3 months, interest free and without penalty if I wanted.
Sceptical that you get now for nowt and that it was another admin process/ incumbrance that I did not want or need, I paid cash and "lost out" on a £500 reduction and 2 "free" services.