Your assumptions are more or less around those prices. Early cosseted cars NC1 can fetch up to £5k with low mileage probably a tad more. Look at NC2’s and anything from £6k to £14k, the top price more likely for a lower mileage last of run out (Mk3.75) of a special edition like the 25th Anniversary. A couple of years ago I saw them at over £17k.
Check out Autotrader for prices although they won’t tell a true price for very low mileage well looked after OC members car if a private sale, they suggest a price to sell at and the seller adjusts. Guessing mines not even listed on their list of models when selling or looking to buy, you have to trawl through the Sport Tech models, it’s got that spec.
Meanwhile, a guide…