This issue has been discussed on the radio... (Woman's hour 2008).
Woman's hour (2008) discussed this issue and outlined how...
Programme title, Year of broadcast [radio]. Channel. Date. Time
Woman's hour, 2008 [radio]. BBC Radio 4. 4 June. 19:00
If one person is clearly responsible for the content of the reference, they can be named as the creator.
This issue is highlighted by Smith (2008) in a radio broadcast...
It is clear that this issue is problematic and has been highlighted... (Smith 2008)
CREATOR(S), Year of broadcast. Programme title [radio]. Channel. Date. Time
SMITH, A., 2008. Woman's hour [radio]. BBC Radio 4. 4 June. 19:00