John notes that he sat before a middle-aged grey suited man who had obviously not seen the light of day for some time and, after a few minutes silence, the Inspector looked up and said: "You seem to be remarkably unsuccessful in your chosen profession, why don't you give it up and do something more rewarding?"
John thought for a moment and replied: "What? You mean become a tax inspector or something?"
"There's no need to be offensive," replied the Inspector.
John says he's rather glad he didn't follow the Inspector's advice. [Since then he's gone onto star as Boysie in Only Fools and Horses and in the spin-off sit com The Green Green Grass]