Legal Aspects of Window Tinting
Current UK law (2006) states that rear side windows and the backwindow can be tinted as required. Tinting of the windscreen must allow at least 75% light transmission. This is 70% in the case of the front side windows.
At present it is not checked at the MOT.
EXTERNAL LINK
For official guidance please check the information at VOSA, the government agency dealing with these aspects.

