Having worked for a few years with a main dealer my step son was head-hunted by a local independent who he has now worked for for several years. They deal in a range of second hand vehicles and he says the market is still buoyant at the moment due to the continued shortage of new cars caused, in part, by both shortage of chips and post-covid production issues. In the current situation you should be getting much better prices for second hand cars than you would normally so anyone offering that sort of depreciation in money is taking the proverbial. As Mick says, We Buy Any Car are pretty good and I know a few people who were pleasantly surprised by their offer.