I'm pleased it's Oz Clark and not the barking mad Gilly Goulden (what happened to her?).
There's a fair old cast of stars in the radio version. Ian Holm as Frodo, Michael Hordern as Gandalf (I loved him for doing Paddington!), John Le Mesurier as Bilbo, Peter Vaughan as Denethor (fabulous actor!), Simon Cadell as Celeborn (also seen in Hi-De-Hi!), Robert Stephens as Aragorn. Oh and James Grout as Butterbur, who sounds identical in his role as the policeman in The Box Of Delights - watched that through just before Christmas, it's wonderful.