OK OK it's a bit of a bodge, but it at least means I can listen to podcasts on the radio again.
To do this you need to have registered your radio with Frontier so that you can add your own stations and stuff. If you haven't done this there are instructions in the handbook but I got stuck and ended up getting Roberts to go through it with me.
Once you have that bit working go to http://www.bbc.co.uk/podcasts
and find the station you want and then the progamme you want to listen to. You'll then see ON THE LEFT HAND SIDE a list of all the available episodes, each with a "DOWNLOAD <filesize>MB (right click & "save target as / link as")
" below it. Right click like it says BUT INSTEAD CHOOSE "Copy Shortcut" or "Copy Link Location" and not Save As!
Log in to your Frontier account and go to Add New Station. In the 'URL' field paste the link you just copied, and in the other boxes just put whatever you want - just don't leave them empty.
Turn your radio on and from the Internet mode got to 'Station List' then 'My Added Stations'. You will see the podcast you just added under the name that you used on the Frontier website. Select it and it will play.
Great, right? Not really because for each podcast you have to run through the process above. I've set up one 'station' for each of the programmes I listen to and edit the URL each day to the most recent episode. It's not as smooth as having it already on the radio, but after a day or two's practice it only takes five minutes to make the seven or eight changes - especially as I can do it while I'm at work and it means I can listen to what I want when I get home. It takes more time for my laptop to turn on and load iPlayer than it does to add the podcasts manually!