Really if you do not know much yourself, you need a full HPI check, and probably best to pay an independent specialist of some sort to have a good look at the car

Prices have went mental over recent years/months....that bubble is bound to burst at some point. But you're right in the middle of the massively overinflated prices. You'd want to make sure at least that what you're buying is a decent and safe car so it might stand a chance of holding some value in 5, 10, maybe 15 years