TBH, i've had the tints for almost 4 years now and i've never been pulled yet. Weston Super-Mare is supposed to have a bit of Hitler complex about tints so if I venture down that way I usually drive with the front windows down. With light smoke on the front it is just over the 30% limit. I think its down to the discretion of the officer at the time.
There are so many cars with tints nowadays, it would just be really unlucky if you got pulled.
:roll: