You might want to have a look at get_iplayer.
The version in the repos isn't fully functional. But the latest version is. Rather than installing all the dependencies one by one, it would be easier to do this.
Get the old version and everything it needs, plus git to get the latest version
Then get the latest version
sudo apt-get install get-iplayer git
Replace the old version with the new version
git clone https://github.com/jjl/get_iplayer.git
Now use a keyword to search for a radio program. I like the Punk show on Radio 1
sudo mv get_iplayer /get_iplayer /usr/bin/get_iplayer
Wait a few minutes and get_iplayer will find all the available radio shows and give you any matches at the end. In my case
get_iplayer --type=radio Punk
It's the number at the beginning we are interested in. To download it
11892: Punk Show with Mike Davies - The Lock Up stage line-up revealed!, BBC Radio 1, Experimental & New,Guidance,Music,Radio,Rock & Indie
get_iplayer -g 11892