I believe that UK prices never compare well to prices on the continent. There seems to be a much stronger market for used cars, especially if they are rare, on the continent. But even if they are not rare, it is a strange phenomenon that us Continentals drive our cars generally more, and yet are also prepared to pay more. Try finding a 360 Modena or 550 Maranello with less than 30k miles/50k kms, it is next to impossible. Most have between 70k - 100k kms these days (as does my own). And surprise - they do not melt in the rain either.
This Esprit is my purchase. Considering what I could have bought for the same money, I do not think this is strong money at all. A nice 996 Carrera 2 would have set me back about 10% less. A nice 997 about 10% more. A very good mate of mine bought his Porsche Boxster for GBP3.5k. I could not find any below 12k and finally brought one from Germany for 18k with 2k import taxes on top. It is just a different world over here. Particularly LHD English-built cars. Consider my Griffith 500 - bought in 2009 for EUR35k. A good 500 will now fetch far north of that, around 50k. Regular 4.3s are close to 40k - IF they are LHD (only 121 LHD Griffs ever built).
There is one other Turbo SE for sale in the Netherlands at the moment, for the same price. And I believe it is not as nice as this one and certainly that shop does not instill a lot of confidence in me (that is just a personal opinion based on a visit there a couple of years ago). If we look Europe-wide, then there are a handful but most are much more expensive (70k up) and most are not as nice.
The dealer selling this Esprit to me said he sees one come by in this condition maybe once every 6 years. So I am very happy with the price I paid, especially comparing to her contemporaries (try buying a 964 or 308 for that money!) and I believe that she will be depreciation proof. She will be driven, though.