if you’re not taking your computer but have a smart phone / mp3 player then go mad now downloading podcasts from R4 and others, build up a good back catalogue of listening.
From radio 4:
History of the World in 100 Objects
More or Less
Friday Night Comedy
Wireless Nights with Jarvis Cocker
The Infinite Monkey Cage
Comedy of the Week
Documentary of the Week (especially the Ben Goldacre one)
From elsewhere in the web/world:
Snap Judgement (theres literally days of listening in their back catalogue and its all top class)
99% Invisible
This American Life
Robin and Josie’s Utter Shambles
Answer Me This
Freakenomics Radio
The Rouleur Podcast
VeloCast