[/quote]Sticky,thanks for sorting that out,just wondered why you suggested the 30D body instead of the 5D which i have used on the short circuits and had some good results using the predictive AF.I did Keppel gate to Kates last TT and got some good shots with front wheels pawing the air.Wanted that 600mm to have a go up at Guthries to get the same sort of shot that is on the front of Mick Duckworths book or do you think i have the gear to achieve that?[/quote]

The 30D has a 1.6x crop factor compared to the 5D which is the equivalent of 35mm full frame. This will make your 100-400 behave like a 160-640mm zoom, so you have an effective focal length increase over the 5D. I don't know Canons well enough to say if the AF on the 5D is better than the 30D but to be honest, anything lower than an EOS 1D will struggle at somewhere like Ballacrye, so don't be afraid to use manual focus.

As far as gear goes, you seem very well set up for most things. The 100-400 on either of your bodies is an excellent tool for the TT course. To be honest it's very easy to get carried away with equipment. All the gear in the world won't help if you don't have an eye for a picture :wink:

Rusty makes a very good point about light changing during a race (or practice). Think about where the light will be and how it will change. You could go somewhere that's great for one lap and a nightmare for the next five! The entry to Parliament Square is a perfect example. Great in the morning - horrendous in the afternoon. I'm assuming, of course, that it's sunny...