not to be a nitpicker, but there isnt a 'legal' tint on the front side windows.
light tint has a VLT (visible light transparency) of 50%, and the uk limit is 70%. seeing as most cars are already factory tinted to at or near that already, anything other than a clear film is 'illegal'.
global tints have given cutesy names for what is essentially light (50% vlt), medium/dark(35/20% vlt) and limo (5% vlt).
on their site Tint Generator | Global Tint
they call light Twilight, medium/dark (its hard to tell in the photo, could be either depending on the lighting, but im assuming dark) Luna, and limo is Onyx.
they dont seem to offer a clear film (pointless anyway imo) so the lightest they offer is light/twilight @ 50% vlt, which is technically illegal.
but what it comes down to is whether youd get in trouble for it. when i had my corsa done, i was told light was legal because noone would know its tinted! i had medium fitted on the front 2 and limo rear as i wanted it to look tinted. never had an issue. on my brera, i have light on the front, dark on the rears. technically illegal, but with it so lightly tinted you are highly unlikely to have an issue.
ive waffled a bit here, but to give a comparison, its like the HID threads that say AFTERMARKET HIDS ARE ILLEGAL YOU WILL BE ARRESTED AND SENT TO A FORCED LABOUR CAMP. ive had them on every car ive owned, and never had an issue. same with 'illegal' tints. but those front tints are definitely not 100% legal.....from a literal interpretation of the road law.
that said, the car looks lovely!
my tinted brera Imgur: The most awesome images on the Internet