Given that this thread has been resurrected from the dead, let me add again, for the sake of any new readers, that radio drama is alive and well, and available to listeners world-wide, on BBC Radio. There's a BBC Radio station, BBC Radio 4 Extra, which is dedicated to repeats of programmes from the BBC Radio archives, 24h a day. All available via the
BBC iPlayer site (click the "Radio" link at the top of the page).