Shame you had a bad day. Mate of mine has been following Simon Crafar aka MotoVudu. Frankly I'm not sure if the guy really knows much as his writing is a bit second-rate (he seems to be developing his fundamental ideas at the same time as he teaches them), but this is a long though interesting piece, and you'll find the ending timely:
http://motovudu.com/blog/view/track-day-safety.html
Better luck for Cadwell!