"Lobster" wrote
| This guy has been a qualified plumber all his life (now in his
| sixties) and I'd feel very uncomfortable telling him he's
| talking b*ll*cks.

Good though he may have been in his day, if he hasn't been keeping up to
date on installation techniques he may be missing out other things. Is he,
for example, dealing with the condensate drain properly (if appliccable) or
the pressure relief valve discharge (it's not acceptable to poke it out of a
wall where it might spray boiling water over someone)? What about updating
controls to Part L?

Owain