Here is the Williams one, I think Simon makes these for them I stand corrected if not but it will give you an idea of costing.
Williams RadJays as was had one fitted to his Black Roadster with good results.
I have the
Mulfab Rad and it's well engineered and lowers the under bonnet temperature on my Plus 8. The number plate on mine protects the bottom of the rad but others on more recent models do fit the air dam to good effect.
