"Once Upon a Christmas Song" was the second single by fictional character Geraldine McQueen from Britain's Got the Pop Factor..., a mock talent contest/comedy by British comedian Peter Kay who also plays Geraldine. The CD was released on 15 December 2008, with the download available a day earlier.It was a charity single with proceeds going to the NSPCC. The song was co-written by Peter Kay and Gary Barlow. In 2016, an instrumental version the song served as the theme tune to BBC One's compilation series Peter Kay's Comedy Shuffle.