i am with tesco, just asked them, no charge as i have a few mods on my 182 already, but they did say, it had to be the legel requirements for the front, about 30% which it is, and got limosine at back and back window, looks pretty cool, but make sure you tell them, thats what they said as soon as you get it done, like matey boy said, it will make it void, if its illegal.
good luck