Thinking about it Hugh... It would be useful if there was a forum indicator on profiles/screen names that showed if the poster is a tradesman or DIYer!
Not all tradesmen are professional in the way they conduct their business and some DIYers are professional and competant in the way they carry out their DIY work.
Stating that Peter Piper is a trading plumber gives no indication as to Mr Piper's ethics, abilities and competance in his work and business practises.
( The Peter Piper in this posting is ficticious )