I'm afraid, that "The Little Ottleys" episodes are not available anymore. But you'll be glad to hear, that a new audiobook (read by Jonathan) was released this month (1 April 2013) - "Belarus" (Afternoon Drama). This play was first broadcasted on BBC Radio in June 2012. You, probably, listened to it.
There is a 3 minute sample on this webpage (It'll be great to hear Jon's voice again).
Jonathan is playing Philip Meade, 35, who is a parish priest at a Roman Catholic church in suburban London.