Missed this last November when it first came out

"Brian Sibley, author of over 100 hours of radio drama and presenter of hundreds of radio documentaries comes on the show to talk about his work for The Hobbit movie guide in the run up to the release of film 2 on the 13th December 2013.
Brian is widely known as the author of many movie 'making of' books, including those for the Harry Potter series and The Lord of the Rings so to get him in a room talking with Publisher of The Hobbit David Brawn was an audible treat. For all you fans out there in preparation for the The Desolation of Smaug here's a very rare and poignant interview about this great man's work and passion.
"

Brian firstly discusses how he was introduced to Tolkien and talks about the excellent BBC radio drama series of the Lord of the Rings. He then offers his insight into Peter Jackson and primarily his adaption of the Hobbit.

https://soundcloud.com/bookdpodcast/all-thing-hobbit-with-brian