Our secretary at work has just got a Puma and she wants to get the windows tinted.

I've noticed the windows are quite tinted from standard and I know the Police can be quite awkward about it at times.

What is the actual law on this ?

I know the rears can go as dark as you like but she wants the same on all windows.

Any advice would be good as she doesn't want to spend money on getting them done only to be told she has to remove them

Thanks