I asked Steve to investigate an unpleasant drains smell in our bathroom. He turned up very promptly, and wearing a protective mask. As an amateur, I had come to my own conclusion about the likely cause of the smell. Being an experienced professional plumber, Steve urged caution and suggested that we investigate three possible causes. He was right, of course. The problem lay in our shower outlet, and the problem has now disappeared. An inexperienced plumbing engineer would probably have taken a different course of action and not found the root cause. Due his keen investigative skills, after years of experience, he identified the issue correctly. Thanks once again for your true professionalism, Steve.