Thanks for getting back and posting that you have resolved your issue and how.
There are other ways to access the radio programmes when in the guide.
Prssing the TV/RADIO button on the remote will toggle between TV and radio, but if you are in a favourites mode then it will knock you out of that.
Another method is to setup and use a favourites list with all your TV and radio channels. When you are in favourites mode it will then show both TV and radio without any switching.