It definitely is not allowed on the windscreen and front side windows, but AFAIK is legal to use on rear and rear side windows.
Dazzling?, if your car has a properly vertical rear window it may cause problems. But the rear window on the majority of cars is sloped to varying degrees, so shouldn't be a problem for cars following. It may be a problem for truck or bus drivers though, depending on the angle of the rear window and the distance between them and you. Having said that, they should be on dipped beam if behind you, so maybe not such a problem?.
Edited by badbusdriver on 07/04/2023 at 18:30
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