I, like Claire n Wullie, got 30% all round on mine, and got pulled the same night as them. Fortunately the new-age cars must have slightly less of a factory tint as I wasn't told to remove them - just "advised" that they were illegal.
This was at a the Falkirk cruise meet where there was always going to be plenty of police presence, i am not going to remove mine - i'll just be careful about where i take the car now!!
Magma in Bathgate done mine - think they charged £50 per window. Excellent job.
Edited to say: This is the 3rd time i've put tints on a car but only ever been pulled that one time. Liked the look on previous cars that much that the scooby went in to get done two days after picking it up from the dealers!! It was my 1st mod