Cheers Steve , yeah I read that I would need a UV clear coat to stop the sun from messing them up. I was gonna start sanding with 600 wet and dry and work up to 3000. I have seen some 3M UV clear coat on Amazon for around 11 quid. No need to remove the bumper though to remove the lights, I took both lights out to put the new bulbs in. You only need to undo 4 torx bolts and the headlights slide right out..
Cheers