Castaldo added that it did not seem that Leon's song would sell as well as last year's Christmas number one by previous X Factor winner, Leona Lewis.

BBC: RELATED BBC SITES

Singles by X Factor winners have had a stranglehold on the Christmas charts in recent years - a run which was ended last year when an online anti-X Factor campaign helped get Rage Against the Machine to number one.

BBC: X Factor's Matt Cardle grabs UK Christmas number one

Launched last October in America and Britain, the product has been a tremendous success, outselling by a factor of at least six the 12, 000 sets that Lego thought it would sell in America before Christmas.

ECONOMIST: Lego