Adding BBC radio streaming shows

Hello,

Just bought myself a Uniti Lite, and really liking it so far.

Using the iRadio function on my Unitilite,

For most BBC radio stations, I can find the past week shows which are available for streaming on their website (for instance, Jarvis Cocker on radio 6).

However, not all past week shows are available on the iRadio section - for instance, I can't find Gilles Peterson on Radio 6 past week show.

Any idea how can I add these missing shows to my radio station listings? 

Thanks