Thanks for sharing this fun, cool find! I'm not surprised to see Elgar represented in Munrow's desert island discs, but am surprised by his favorite book. Men and Animals is apparently written in Italian. Did he speak, read, or write Italian or any other languages besides English? I've read that he was a linguist but have not found more specific information regarding his foreign language skills.
By the way, how well did Munrow know Eric Idle when they were students at Pembroke College? I'd guess they were friends because, as you probably know, you can hear a brief snippet of Munrow's The Leaves Bee Green (?) during a Monty Python parody of the 1972 Elizabeth R series.