One of the books Mr. Rumbolt has yet to return to the North Acton Public Library is "Fly-Fishing" by J.R. Hartley. The book was part of a popular advertising campaign for the British Yellow Pages in 1983. The advertisement shows an elderly gentleman (Norman Lumsden) visiting several bookshops looking for the book, yet no one seems to have it. Hence, Ms. Brahm's comment "That's where it went!"
Prince Charles is the royal who lived in the countryside.