Nice one, Nefir
Mathmo, my guess is that it's an two-hour-long pre-recorded program, which is meant to start at half past the hour and finish half past the hour, with 2 news breaks (on the hour) in the middle.
This radio station started the program on the hour, and therefore only had one news break
(I know, it's a lot of typing to get the answer completely wrong, but it's worth a shot :P )