You can add them. Go here with the browser and choose the link for the radio station you want. It will open in the media player and you can then save it to radio station library:

http://iplayerhelp.external.bbc.co.u...al_wma_streams

I have the Extra Decoders codecs installed. I don't know if that is needed to listen to these streams through media player. But for me they work fine.