I think CB's and Hornets are in with LC's and maybe 400's and some other stuff, maybe FRC but can't remember, sounded like an unusual grid but I still want to do it for the experience. I've not got my entry confirmed yet, but that's fairly normal as it's still a bit away. I'm hoping I get in, but I'm sure it will be over subscribed. My mate has a CB5 for sale if you want to ride a decent race bike

but you can only join the CB5's if you're slower than the rest of us, or at least slower than me:P
WeeJohnyB