If you are displaying your Car tax or any other items on your front windscreen then you are breaking the law as of 30.03.10
If the police stop you they will fine you for this offence,
So take it down but keep in the car at all times same goes for your MOT just in case the police try to fine you for not having any.
This is a Hoax’s its true, I called the ministry of Transport this morning and they have confirmed this
Here is the number if you don’t believe me 22 807000