 TV campaigner Mary Whitehouse (I) (qv) is indirectly responsible  for the growth and success of ‘Mastermind’. In 1973 the BBC were  transmitting a comedy programme called _"Casanova 73" (1973)_ (qv)  starring Leslie Phillips (qv). Ms. Whitehouse objected to the  content of the programme, which she saw as being smutty and  unsuitable for transmission before the 9pm watershed. The BBC  responded by swapping the time slots of ‘Mastermind’ and ‘Casanova  73’. So ‘Mastermind’ went on to prime time and ‘Casanova 73’ went to  the 11.20pm graveyard slot 