I knew I should never make a good businessman when a boy at school sold me his clockwork car and I found that it didn’t work. When I complained to him, he merely hissed, “Caveat emptor. You should have tested it before you bought it.” So, after I left school, I trained to become an accountant. And I have worked for several very successful businessmen in my time, but none as successful as Bobby. Bobby came from humble origins in the East End of London. He started off with a small hardware and ironmongery shop near King’s Cross. By the…