Sometimes you just have to ignore:
"Arguing with a fool just proves there are two of you." Doris Smith
"Whether you think you can, or that you can't, you are usually right". Henry Ford
Then again, be cautious as you obviously are being:
"Half knowledge is worse than ignorance." Thomas B. Macaulay
First off: there are some very experienced plumbers on this forum and they deserve credit and thanks for giving of their valuable knowledge and time. This, of course, does not excuse rudeness.
I was/am a cc and ccc and I have been attacked for it before and I'll probably be attacked again. I finished my 6 week course in Dec 07. Prior to this I did not even know what an isolation valve was. I have just under two years under my belt now (self employed).
First year and a half were very tough financially but very enjoyable. I have not caused any water damage anywhere; I have completed each job I started successfully (not quite true, gave up on some terrible wiring whilst fitting a 3-port valve and got an electrician in); I have enjoyed every minute of it. I have done my unvented ticket, 3 day Hetas course and a solar course. I have spent each and every hour not working researching plumbing and eco-plumbing.
I have: fitted lots of rads including three full house systems; drained a whole hotel rad system (34 rads), mended some 28mm pipework and re-filled; flushed two systems and cured cold rads; cured quite a few airlocks; plumbed in a number of wood burners with back-boilers including new rads (assisting); fitted eight bathrooms including tiling in many; changed cylinders; mended and fitted WC's and their innards; resurfaced a bath; drained down two houses after reposession; drilled no end of 4" holes; fitted two thermal stores; replaced three showers not properly fitted by previous plumbers. etc. etc.
I agree there is a heck of a lot to learn and that I am still learning and will always be. It does not mean that it is unlearnable and nobody except the old school plumbers should be allowed to plumb. After all where are the next gen of plumbers going to come from? I spoke to a time served plumber and he said: "in my first year as an apprentice I carried tools, held ladders, made the tea and did the shi**y jobs. I bent my first piece of copper some twelve months after I started". No wonder some experienced plumbers feel aggrieved at the courses - so would I.
In order to motivate you Neil: During the last six weeks I have worked 26 days of the available working days and financially this has been very rewarding indeed. I am fully booked until Christmas (every single day with a few jobs waiting as "back up" in case I get time or any cancellation). I have 8 customer visits to do and four "probable jobs" for after Christmas.
Good luck Neil.
Sharpen your knife Dick