Stratstones car isn't being discounted...its effectively second hand, NOT new so MMC would not be able to influence price. As Nick says, it's winter, not the best time to sell a sports car and with the value dropping on a new car as soon as it is registered, the price seems pretty ok to me.
I had forgotten the effect that first registration can have on a car. I guess Morgan demonstrator models are quite hard to shift as well. Still seems a pretty good bargain for someone...