Hi FOC, was just wondering if anyone can give me advice on what to clean my head lights with as they look scratched inside and a bit yellow, or would it be easier to just replace them?? 

Cheers, Tom 

I think you can buy a kit to do it from Halfords, it’s progressive grades of wet and dry paper and polish and lacquer to finish.
They will come up nice and much cheaper than new ones.
I did mine at the Bodyshop that I work at, looks terrible while they are being rubbed down but came up lovely when polished.

the trade use white diamond metal polish believe it or not. it can be done using elbow grease but takes ages, or a powered polisher/buff is easier.