Jim its a bit of both. You get purists with absolutely MINT originals or those "Oh my dear sweet lord what the eff is THAT??!!" Max Power-esque cars. Lots of companies like Torquesteer, Pumabuild, Pumaspeed, Autoglym etc etc have stands there and then there's a section thats a bit like a boot sale where random people have heaps of bits for cars.
You can book track time, have a crack at a 0-60 time, if you trust a rather wobbly looking rolling road on the back of a trailer, have your car rolling roaded... Its pretty huge and usually blazing hot weather.
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24/03/05 to 27/06/12 & I loved it