Comparing the values gets a bit weird. If you want a mint condition 4.0, it seems you'll pay out the nose for it compared to a mint SC. However, 4.0 values seem to take a decent hit once they've been used enough. You've got a SC with 12,000km that's holding a 20-30,000+ GBP value over similar mileage 4.0s. There's another SC with near 23,000km on it that's holding better value than a similar 4.0 as well, but there is also bottom-market SC selling for 16,000GBP less equally.
4.0s:
595,000GBP - 700km
470,000GBP - 3,300km
345,000GBP - 28,600km
330,000GBP - 1500km
317,000GBP - 6,700km - JZM car
315,000GBP - 16,100km
306,000GBP - 12,000km
287,000GBP - 24,000km
SCs:
358,000GBP - 500km
335,000GBP - 12,300km
314,000GBP - 22,700km
271,000GBP - 25,000km
I think the 345K & 330K 4.0s are priced outside of where they should be, personally. The 1,500km car is probably right where it should be & upper 2 are way over-valued, or it's a steal compared to the others. I think the 28,600km car is well over market unless the Belgium market creates such a significant difference in price.