Things cyclists should know … POV driver who's incapable of cycling

stolen text.

a) You could be stopped and fined - you are effectively handing the police a 'reason' to stop your vehicle - the car could be impounded if it is considered dangerous to drive and/or could be given a prohobition order until removed!

http://www.carkeys.co.uk/features/law-window-tinting-2

Yep, it would be a Construction and Use offence, as using a mobile phone at the wheel is a CU80 offence.