Yep - as Andy says, this is a rare car.
To put it into context, it is one of, if not THE rarest of all the AMG models in the UK.
I have seen this car in the flesh, and have never, ever seen a single other one ever - for sale, on the roads, online etc - NONE! Only one 202 C55 estate for sale with very high mileage - which I once saw parked up in London (so long as it wasn't just a badging excercise!)
Might seem expensive, but you have to appreciate that it is not just a C43 with a '55 engine. It's a full conversion with a modified shell for the running gear.
I think these were about £20K more expensive than a C43 new.
Nigel (the owner) will know exactly what it is, how rare it is, and will set his asking price accordingly. He's had plenty of rare/niche MBs - SL60s, 500E/E500s, E60 AMG 124s, 190E 2.5-16 Evo-1 etc.
Find another one for sale cheaper?
I wouldn't want it for that much myself, but it only needs one buyer who appreciates it's rarity
Will