Their are a few people who run older cars in the Mid West on a regular basis, and enjoy running them. A guy at Kidderminster yesterday was running a Fab 2000, which was the mid motored version of the Cougar 2000. as for spares, Schumacher still do spares for their vintage cars and are available. Have a look on Schumacher website and checkout Vintage Section.
Cougar 2000 was a good car in it's day.
Cars have moved on year by year, so if you going for the fun of running a vintage car, or you want to have latest models, it's your choice but you definately won't be laughed off the track.
You won't have to spend a fortune to get going, and if you come to the Mid West to race, you will be welcomed and advice is free!
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