There are dealers who take in and sell some very nice older modern cars. But the cars cost a reasonable amount because the dealer has paid good money for an outstanding example, taken the risk and sorted everything before putting the car on the market with a warranty. The link below is to one such dealer that I tend to keep an eye on for the car I want - a 2010 CLS in a particular colour and engine combination.
https://www.ebay.co.uk/itm/143345343787
The reality is that most members here critique 15+ year old £500 MGR cars in fine detail about their worth. This has nothing to do with trading constraints but the value of a 15 year old car and the risk associated with buying (or selling) one.
Finally, in the old days, a 10 year old car would have been considered ready for scrapping. The OP's car is at least 17 years old based on his post.