As Radio broadcasts are the production of a collection of individuals, they should be cited using the title of the broadcast first. For programmes within a series, the episode should also be indicated after the series title.   

Format:  
Title – in italics. Number and/or title of the episode – if needed. (Year of distribution – in brackets). Name of broadcaster. Broadcast or transmission date.    

Bibliography example:  
It’s Not Just about the Music. 1968 Season. (2008). BBC Radio 4. Thursday 10th April.   

In-text citation example:  
If you refer to a radio broadcast in the body of your work, the title will need to be underlined or placed in italics: 
 …highlighted in It’s Not Just about the Music (2008)…