Most people over here tint black and are surprised when the get pulled. I'll see if I can find what I originally had - which was 100% ok in the winter due to the sun level. In the summer, I almost had a police car drive into the back of me. I was asked to remove the tint instantly or get a fine and car off the road.
Variant 1: Legal - what you're looking at is the FlyEyes kit. It's a honeycomb structure and gives a overall lighter look. However... When you polish the car, the polish gets stuck in the honeycomb and for me it wasn't dark enough. I was also trial fitting the GPvR spoiler (which I sold for AU $700 delivered), spoilerless and original. I decided original looked the best.
Variant 2: Illegal
Variant 2: Less Illegal - barely got by with the red reflective material on the inside edges.
Variant 3: Legal because the reflective material met the minimum requirements for an MOT/VOSA, however brake lights were invisible during the daylight.
Variant 4 is what you see in red and everything is still visible.
They've all got a green rating as dead simple. 
