I knew there would be a lot of hostility in regards gas/boiler videos on a forum like this. The fact remains, up and coming plumbers that are in college or on courses are crying out for videos like this, which completely demystifys the whole thing, makes it clearer and easier to understand and shows it is not has hard as the textbooks make out it is at NVQ lv3.
It is not about promoting illegal working on appliances in the home, but the distribution of knowledge for any that want it, we have already seen legal specialists in regards the publishing of such information and Youtube have no problem with hosting it.