Nigel,
No, the Motorart model is most definately not Minichamps standard. My Rydell estate is actually a Motorart and I'd love to change it for a Minichamps one. The decals are poor, the wheels shocking and I swear it is based on a 4x4 road car, just with a few decals added!
All in all I'm not doing a great job of selling the one I have, am I?
You must have a good few models, post em up!
One thing I've wondered about is the 1999 Vectras. They were apparently never released as Onyx went pop before they had chance to distribute them. Were they ever made, do you know? ie Were they left in a store room somewhere after Onyx shut up shop or did they never make it that far?