Radio 4

The original BBC Service, changed it's name from the Home Service sometime in the 60s (?) Famed for calm voices and occasional bouts of hideous over-pretention - usually on the part of Melvin Bragg.
 
Home of the world's longest running soap opera (The Archers), the Shipping Forecast, Brian Perkins, Test Match Special, Just A Minute and I'm Sorry I Haven't A Clue among others. Known for fostering new comedy talent prior to it's move across to television, from Tony Hancock and The Goodies (I'm Sorry I'll Read That Again) to Dead Ringers and Whose Line is it Anyway.
Danny Wallace once produced a Ross Noble show called Ross Noble Goes Global on the station (still available online via the listen-back service) and Dave Gorman has a new show Genius on the way that has recently been recorded.