The latest RAJAR figures are available here (it's a big file!).

Coments are here,
and for a review of National Stations here,
and HOW people listen, here.





(RAJAR (Radio Joint Audience Research Limited) was established in 1992 to operate a single audience measurement system for the radio industry in the United Kingdom.
RAJAR is jointly owned by the BBC and the RadioCentre. Prior to this, the BBC and RadioCentre’s predecessor (The CRCA) carried out their own measurements independently of each other.)

(Thanks to Rajar and Mediatel)