Nicely specced but the interior looks FAR MORE worn that 77k. Check the steering wheel and leather. The bolster is just completly knackerd yet the seat belt covers a fair bit of it. Then theres the wheels which are corroded and kerbed a far bit. Its up on ebay as well with a lot of high qaulity images and you will see what I mean when you see them:
Also the trim around the radio and heater controls is from a facelift Sport model and the rest of the trim from a pre facelift sport model (the correct trim for the car)
The C43 is a striking colour and looks very well cared for.
I think price now can get subjective in that there are a lot of tired and abused C43s from £3-5K, so if one comes along that has been pampered and cared for it could well command a premium to someone who wants a clean example.