Depending on the kms (miles) his Clio has 12k wouldn't be that unrealistic over here. Just look at the following link for example.
That's what's on the market on one of our main sales platforms at the moment. It's not much as you can see and since quite some time there are less and less good examples available while the prices are going through the roof. I've an offer for mine that's 1k below of what I've paid but that's from a dealer in France that would buy it unseen and has to pay for trans- and import mind you. If I'd sell now I'd actually ask for 1k more than I've paid about five years ago and would presumably get that. Here good or rare examples actually are an investment. Not like a V6 or what ever but they're at least holding their value and depending on what you paid you can make a smaller profit if you'd sell now.
This seems to be the case in basically the whole EU. Not sure why this isn't in the UK? I mean you surely also have a shortage of new cars which in turn is raising the prices for used cars and I'd assume the number of good/rare examples also isn't rising. Do people have to sell because of economical reasons like it was the case in southern Europe where you could buy cars like E30 M3's for quite good prices when they were hit hard?