just be careful if you get the whole lot tinted, i dunno what the limits are and stuff, but i know the police used to be pretty hot on that sort of thing (front windows anyway). be a pain to go to all the effort of doing it to be told to take it off :/

The limits are:

Front windscreen 25% tint allowed.
Driver and passenger side windows 30% tinit allowed.
All other windows, unlimited.

As clear glass cuts down some light anyways, you might not legally get away with adding any tints to the front windows.

Well... that information came from the a government website here:

http://www.vosa.gov.uk/vosacorp/repository/Tinted%20Windows%20Nov%202005.pdf

It does say there that windscreens must allow at least 75% light through (hence my comment that 25% is allowed). In reality, due to glass cutting out some light anyways, there isn't much that you can change there.

you cant tint your front passenger/driver windows with out "breaking the law" but as long as it aint stupid dark and just has a light tint you wont get trouble off the cops as my last car was tinted on the front and didnt get any bother and a few of my mates all have them to, drive like a F***y and they will stop you and find something to do you with but if you never get caught they wont do nuttin to you

I know in France there no proper law on tinted windows! basically any window can in theory be tinted but if u have ur driver and passenger window tinted then they could fine u for it and ask u to get rid of it at place!