U2 helped drive sales in Britain: their latest single Vertigo was last year's most downloaded track, followed by Gwen Stefani's What You Waiting For? The traditional singles chart for last year is a radically different list, topped by Band Aid 20. This is partly because, despite the boom in download tracks available, there are still many that cannot be accessed through most online sites. Dario Betti of computer consultancy Ovum said: "The online chart would be very different from the traditional top 10 because [download] customers are older and richer than the traditional singles buyer.'