The song has already been performed on the current series of the ITV show, by 17-year-old Diana Vickers, who is currently 13/8 favourite with bookmaker William Hill to win the final being screened live on Saturday, December 13. Eoghan Quigg currently ranks second favourite, while the same bookmaker offers odds of 1/5 as the runaway favourite for the eventual X Factor winner to top this Christmas's singles chart.

The selection of Hallelujah follows huge exposure for the song, which was ...