Josef Locke was a real Irish tenor who enjoyed great success after the Second World War, to the extent that, in 1948, he was earning approximately £2,000 a week. Then in the 1950s the tax-man became interested in his earnings and Locke subsequently disappeared. Around about the same time, a new singer of similar build and vocal style called Mr X started appearing in clubs and everyone started to believe that this was in fact Locke under a new guise. Among those who were particularly convinced were the legions of women whom Locke had reputedly slept with, as the man had an enviable reputation as a lady-killer.