I'm sorry, this is just making me laugh too hard. Because he does it in the same calm, cultured voice he uses for the Book, or for Reginald Jeeves in 'Jeeves and Wooster.' So very wrong.
They also kept 'Journey of the Sorceror,' the original Hitchhiker's Guide themesong from the radio series (which has been used in pretty much every version since), in the soundtrack. So, yay. :)