Have you been to Lydden Hill recently?? It's OK at best for bikes, but it's dog shit for cars. You can learn Lydden in about 10 laps. After that you might as well be sitting at home holding a heat gun to your tyres and pouring the petrol down the toilet.
There's too much rubber laid down by the drift guys who are there once a month too so the variation in grip levels are extreme.
Lydd:
Lidden Hill