seconded.
I did have a chat to a plumber about some things and one was him telling me about roof gutters.
the regs behind them to get it up to code were crazy.
told me its quite rare to find someone who will do it right the first time.
where as he makes sure anyone he has doing them does it right so they don't have to go back a 2nd time.
this was the handmade ones, not prefabbed and bought ones.