If I'm working with others, it's Absolute radio, (nee Virgin), as it has the right mix of music for most tastes. If I'm alone and want to hear music (other than CD), it's usually XFM, but 90% of my radio listening is BBC London 94.9.
I don't know about you guys, but people I'm not a fan of on TV, are perectly acceptable on radio. IMO, Danny Baker can be a bit OTT on TV, but I think his show from 3 - 5 on 94.9 is one of the best things out there.
Robert Elms is a bit sanctimonius, but he can have quite good guests/segments.