I'll be there tomorrow as well (I'm the event organiser).
The "cow shed" grandstand area is the place to be if it's as wet as they are forecasting, as you'll be under cover and the cars tend to powerslide out of the hairpin (watch out for the white Porsche GT3). You might need to stand back from the edge, as even at 70mm you might be too close to fit a whole car for a panning shot parallel to the car, though you'll probably be OK with the minis. You'll need the 200mm for head on shots coming out of the hairpin, or at the other side of the track approaching the hairpin.
You'll be able to take shots of the cars coming up the straight from the pit wall area, and in the pit area itself (most drivers will huddle in the pit garages during the rain).
There's high fencing now between Duffus Dip all the way through to the exit of McIntyres, but there is sometime scaffolding at the top of Duffus Dip that the TV camera use that you can climb onto and shoot over the top of the fencing. I'd recommend getting into your car and driving down to this area of the track instead of walking. You can of course walk over the bridge to get to the inside of the track, and there's only low fencing and you'll get shots of the cars as they come down Duffus Dip. You won['t get much warning of them coming though, as your line of view will be blocked by the marshals post.
After the exit of McIntyres, there's only low fencing up to the chicane, and you should be able to get shots like the following with your 70-200:
There is high level fencing at the outside of the chicane, but there are come handy holes in the fences that you can point your camera though to get shots like this:
The above was taken with a 100-400 at full stretch, but isn't cropped.
After the chicane, you can get some nice shots of cars going into Clarks with the sky in the background:
There's only low level fencing from behind the marshals post here all the way down to the chicane, but it's only a straight so not many interesting angles.
My album from the last track day there is here:
http://www.flatoutphotography.com/gallery3/TSJ11/page/1
If you are going to be moving around the track, I would recommend the following:
Warm waterproof clothing, consider taking gloves and a warm hat.
Comfy waterproof boots or shoes.
An umbrella
Perhaps a change of socks and footwear.
There's no charge for additional drivers tomorrow, so if you take your drivers licence you might be able to talk nicely to one of the drivers to you drive their car. There's also no charge for passenger laps with any of the drivers (just sign on at the helmet store and ask the drivers nicely).
There is also free instruction available a Knockhill instructor throughout the event, whcih is included in the ticket price.
John
