I admire your bravery sir.
I have a friend

who has just got hold of toca3 on ps2 and my friend

reckons that the reference points are no good, however the profile of the corners seem relatively accurate but my friend

reckons you shouldn't be so tight and book a track day.
Anyway the only two corners (exit speed is the biggie) that matter at snetterton are russells and the second (sears i think)
Cheers
Rich (and friend

)