Thanks all! :dance:
The company is called
Car Hood Warehouse | UK's Number 1 for convertible car hoods and soft tops in Surrey | MAZDA, MGF, BMW, VW, PORSCHE in Surrey, I'm going to go for the black with the smaller glass, they custom build all their roofs to OEM Porsche specs.
Topless has a point- fun in the sun sun sun is all we know
I even saw through the clouds today, to some more clouds hiding behind
Nimbus- I looked into some reviver for deep blue which had seen some good results but I'm terrified of ending up with a dodgy patchwork quilt on top
Ray - looking at the rear view from the inside I can see a significant drop in visibility as you said, about 30% less or so, although this seems a lot I spend most of my time grinning through the front anyway