I went to Stoneleigh a few years ago when I was considering a kit.
I went to see the Raw Stryker seven style car. I held out though and bought a 4/4 instead!
There are some awesome cars to be had and also some horrors!
All the main players were there and you could find cars from low£k to top end at a£50k+.
There were some clones, body mod kits to create replicas such as Ferrari on a MX5 donor!
Ferrari apparantly took exception and rightly so!
The majority of cars were Lotus7 variants in addition to Caterham and Cobra variants.
A couple of nice old Jag replica kits.
Gardner- Douglas has some great Cobras and a Lola.
Ultima had their Cars too- superb.
A number of kit companies have come and gone over the last few years but the industry is still a good place to look. Some handy sources of components/ parts etc..