Docker image for the get_iplayer script as distributed @ https://github.com/get-iplayer/get_iplayer.git
docker build -t getiplayer:latest .
To download, for example, all episodes of the 'Radio 1 Rock Show with Daniel P Carter' to /tmp/downloads on your host machine, just run:
docker run -v /tmp/downloads:/downloads getiplayer:latest "Rock Show"