I saw a topic on Facebook about this the other day. It's actually in the Highway code...
229
Before you set off
remove all snow that might fall off into the path of other road user.
I think the police will be taking the stance of "all items on or in the vehicle must be secured". The snow on ya bonnet or roof clearly ain't secure. I went out specially to buy a long handled brush with soft bristles so as to be able to clear the roof and not scratch the paint. Think it cost about £3 from TESCO.

















