They do you for driving a dangerous vehicle mate i know people who have had it done the old bill went on a misson down here and done LOAD'S of people on it it's the bike cop's and the traffic car's that have the stuff to do the testing. I would'nt want to take the chance mate it's not the fine that fuck's you it's the point's but then it's down to you you might be lucky and never get pulled. Imo if they class it as dangerous then it should be brought into an M.O.T test as there are ALOT of people that dont know that there driving round with illegal tint's my mate had his car imported from japan and the first he new of it was when he got his 3 point's and fine