A duet between Katie Melua and the late Eva Cassidy has knocked Leona Lewis off the top of the UK singles chart.

The singers' cover of What a Wonderful World by Louis Armstrong, the proceeds of which go to the British Red Cross, ends Leona's seven-week reign at number one.

But the former X Factor winner can console herself with the fact that her album, Spirit, is still outselling everything else for a fifth straight week.

Despite the success of What a Wonderful World by Melua and her idol Cassidy – who died of cancer 11 years ago - Leona's successor as X Factor champion Leon Jackson is still favourite to claim the coveted Christmas number one with his cover of When you Believe.

Festive-themed songs dominate the top ten, with Mariah Carey moving up to number four with All I Want for Christmas Is You, while Fairytale of New York by the Pogues and Kirsty MacColl is at eight.

And in the albums chart a late surge from Michael Buble sees his Call Me Irresponsible move into third place, one behind Westlife's Back Home.

Top ten UK singles (last week's position)

1 What a Wonderful World - Eva Cassidy and Katie Melua (new entry)
2 Bleeding Love – Leona Lewis (1)
3 Crank That – Soulja Boy (10)
4 All I Want for Christmas Is You – Mariah Carey (8)
5 Call the Shots – Girls Aloud (3)
6 Apologise – Timbaland featuring One Republic (4)
7 Rule the World – Take That (5)
8 Fairytale of New York – The Pogues featuring Kirsty MacColl (12)
9 Heartbroken – T2 featuring Jodie Aysha (2)
10 What Hurts the Most – Cascada (16)

Top five UK albums

1 Spirit – Leona Lewis (1)
2 Back Home – Westlife (2)
3 Call Me Irresponsible – Michael Buble (21)
4 Mothership – Led Zeppelin (8)
5 Long Road out of Eden – Eagles (4)

16/12/2007 20:48:56