Glassylite..
Hamish I tried the plastx and mguires and yeh it came up good, but only lasted a couple of days, the thing that's good about the glassylite is the 'nano sealer' to stop it from yellowing a lot longer..
The bepore picture is with plastx, and about 20 minutes of constant polishing on each headlight. 2 days and it was yellow again, and worse than before lol