 Frank Windsor (qv)s character is the driver who leans out of his  car window tapping his watch, as he does so a short burst of the  Music Hall tune "If you want to know the time, Ask a Policeman".  Windsor was well known in the UK for playing a detective in  _"Z Cars" (1962)_ (qv) and later _"Softly Softly" (1966)_ (qv)