However there is now:
Mini Se7en S Class
The Mini Se7en S Class is aimed at drivers on a budget. Whether you are a complete novice or an experienced driver returing to racing, the Mini Se7en S Class allows you to join the Mini Se7en grid. With modifications and improvements strictly limited the budget for a season in an S Class car is going to be affordable. While racing with the more highly tuned Se7ens, an S Class car isn't going to be a 'tail end charlie', top 10 finishes are perfectly normal here.
Blimey tempting!