Agree with this.
Two years ago I sold a Renault Espace for 7k. A year later the same car was going through BCA under the UGCGS banner, having only done average mileage since it left me and having had no more change of keepers. The odd little mark here and there, apart from that it was the same car. I was delighted to buy it back for £3500 even though it was 'on sale' at 3k. God knows what my (ex) customer was thinking of although rumour has it he went on to manage Newcastle United.