I didn't read the post properly 😳
Maddox - Caterham supply the aeroscreen, and initially you have to replace a small channel section on the chassis (bolted on) with one that has captured bolts (easy job). This then stays in place for both windscreen and aeroscreen. Once the windscreen is removed attachment of the aeroscreen uses one of the windscreen mounting points each side. You have to fit the mirrors (supplied) to the aeroscreen and can still use the tonneau. Pull off the wipers, and there you go. (Don't forget the licence either - most use a M/cycle holder). The only job left is to fit some bullet conectors to the heated windscreen so you can easilly connect back again.
Caterham supply a simple composite version which I have, or you can go for carbon, or you can go to other suppliers for different shapes of carbon (Richard in France etc)