On Saturday nights (from 7:00pm till some time after midnight) the frequency is 98.8, Instead of BBC radio 1. As for the rest of the week I dunno :/
On a personal note, listen to Saturday 12ths Xtra broadcast with MistaJam, it's NIIIICE :)
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103.7fm
A lot. There is: BBC 1, BBC 2, BBC 3, BBC 4, BBC News, BBC Parliament, CBBC, Cbeebies, BBC Iplayer, BBC England, BBC Scotland, BBC Wales, BBC Northern Ireland, and BBC America There is BBC radio channels too: Radio 1, 1Xtra, Radio 2, Radio 3, Radio 4, Radio 5 live,5 live sports extra, 6 music, radio 7, Asian Network
107.4 FM
It depends what media you're listening on but it's available on... FM: 92.8 to 94.7 MHz MW: 810 KHz DAB Freeview: Channel 719 (Scotland only) Freesat: Channel 712 Sky: 0116 (UK only) Virgin: Channel 930
BBC Radio Collection ended in 2004.