Every week or two I rip some new music from Radio 1 for my IPod Nano w/RockBox firmware (had to throw that in). It looks like they've changed the stream URL format. They used to use the DJ's name in the URL, but now they are using the day of week and show time. Here's a couple examples.
Pete Tong: rtsp://rmv8.bbc.net.uk:554/radio1coyopa/radio_1_-_friday_1900.ra Fabio and Grooverider: rtsp://rmv8.bbc.net.uk:554/radio1coyopa/radio_1_-_sunday_0100.ra