Do you get nicked if you use a dark tinted visor in england ??

[Grahamm]

just as a footnote, the risk of retinal damage is far higher when using a fully black visor (unless it's a genuine arai/shoei) as there are no UV filters on them and the pupil is more dilated due to 'less' light hitting the retina.

A good point.

I much prefer to use a pair of sunglasses under the visor, I don't have to carry a spare visor for if it gets dark and they give UV protection.

Add a couple of strips of Electrical Tape across the top of the visor for a sun-screen and you're sorted.