thats the crucial thing mate,experience.i think though that the majority of plumbing businesses want a school leaver(16-18 year old) who they can skivvey about(no disrespect) instead of an early 30's(old bas).i might be wrong though on that one.just need that breakthrough....!!there must be something elusive in the plumbing trade or any of the trades as a matter of fact because all of the colleges in the local area have got waiting lists(grass is greener an all that ).at the end of the day its supposed to be good pay innit?