Apparently the BBC world service is 198LW or 648MW but i always listen to it digitally
FM: 92 MHz - 95 MHz LW: 198 kHz MW: various DAB: 12B Freeview: 704 Virgin Media: 904 Sky Digital: 0104 UPC Ireland: 910 Internet: Streaming Audio Real/WM FM: 92 MHz - 95 MHz LW: 198 kHz MW: various...
Depends which country/county you are in. Anywhere from 88-91 FM should see you right.
BBC7 is a solely digital service, so the wavelength isn't really appropriate - you can receive on a DAB radio channel 12B (which operates on BAND III - 174 to 230 MHz), digital satellite (channel...
depends where you are see http://www.bbc.co.uk/worldservice/help/index.shtml#bookmark-2