Problem recording radio programs using version 3.12.0

[Yusuf Osman]

Hi, as the subject says, using Get_Iplayer version 3.12.0 I can't record radio programs using the following strings:
get_iplayer --type=radio --get "drama"
get_iplayer --type=radio --get "book at bedtime"
Get_Iplayer reports no programs found.
Any ideas?
Yusuf