Windscreen does it make much difference?

[BIRMA]

I've been looking to buy an Atom or similar car and have noticed that a few on Pistonheads have windscreens fitted.
Could someone with one tell me if it cuts out the majority of the blast at 60 mph+

[BIRMA]

KMF said:

best to ask on the Atiel Atom forum, not much Atom chat goes on arround here.
the "Gun Sight" wind deflectors may be small but quite effective at deflecting the wind arround your head. i had a car without now one with and there is a notable difference

Thanks

[BIRMA]

AshleyPatience said:

I took my screen off at the weekend, and preferred the car with no screen. Absolute need for sunglasses; and a helmet for longer / motorway drives.

I'll put the screen back on for winter as the cold air is an issue at any speed.

Do you know how the law stands reference the wearing motorcycle helmets in and Atom or similar car, is it legal?