308.On The Buses.Radio Control.

At  Blakey's behest a two-way radio system is installed in the drivers' cabs,meaning that the depot can hear what is going on in the cabs at all times - not a very popular idea with Jack and Stan. However,when they pull two conductresses,one of whom leans against the radio switch,turning it on, Blakey hears the sweet nothings Stan is telling her and assumes that they are meant for him.