While I agree that NGL are great plugs there is nothing wrong with Champion as long as you buy NOS. The new Champion plugs do not have the glazing on them that keeps them from fouling out. I have a 1962 stage 3 MG MIDGET MK1 that runs Champion plugs as they are the only plug that works and lasts the whole season. They are a basic copper core plug as our LBC were made to run Copper Core plugs only. If you have any doubts just call Advanced Distributors and he will concur. I buy all my Champions from your country, the UK, as the GREEN SPARK PLUG COMPANY has lots of the older style plugs. He sells all make of plugs plus a lot of other stuff too.
ROBBIE