To mess with gas yes but to be a plumber no, also you don't need to be qualified to do electrics have proper look oh and look what time served means whilst your lookingWhat? By the sounds of it most of the people on here aren't qualified, they're "time served" and probably learnt off somebody who wasn't qualified either.
Just because you've been doing something a long time, doesn't mean you're doing it right just ask your wife, she knows
You have to be qualified and registered to work with gas or electric... Look it up mate.