They are all so old now, it's condition rather than mileage, imho. If I saw a 100k mile model with tons of receipts for clutch, bushes, exhaust etc relatively recently in it's life, it felt tight on the test drive, and was £8,000, I'd have that over a 40k model for £12,000!
Low mileage won't guarantee a good clutch, bushes, discs/pads etc... engine might be better, but if it's had really low usage it might have missed the 2yr service interval too.
Also, the engines seem to be strong and last ages.
Again, it all depends what you want. More mileage is cheaper to buy, but may cost more to keep going than a lower mileage one, but that all depends on individual cases and conditions.
Personally I tend to avoid low usage models because cars that don't get used often have their own issues because they are under-used. 12k a year almost guarantees a service every year. Also, too higher mileage can be bad in other ways. All depends, but basically I wouldn't write off a car for a few thousand miles, if it was otherwise in need of no real attention. Also, good seat/colour combo there on Herminators car... M-sports in red are rare to start with, and on a nice black example!
Dave