BigWallop wrote:

Maybe that's why the government are trying to introduce new
legislation to make it law that any work be certificated by a
qualified fully trained person, and are trying to stop the rot of the
DIYer on this type work. It is dangerous to play around with
electrical, gas and building installations if you don't know what and
how things work on them.

While agreeing with your earlier points, this last bit is tosh. Every
trade from glaziers to car mechanics is trying to find a health & safety
or environmental pretext to ban DIY, and they're largely motivated by
greed imho.