I think there is quite a large thread about the RS500 and their histories on the TNF forum. Short of attempting to unearh my great stack of Autosport magazines from the back of my storage container I can't really add any more to the photos I posted. Certainly some of the UK cars were run on minimal budgets compared to the factory supported teams, much more so in the following seasons. There were also a large number of Sierra Cosworths being run in the production saloon races in the UK at the same time.