If you're talking about the version that I just saw today (26/06/2008) on ITV.... then a search on "www.last.FM" reveals that Alma Cogan sang a version of "Jolly Good Company" if that's any help.
You can listen to a sample at..
http://www.last.FM/music/Alma+Cogan/_/Jolly+Good+Company
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Guns N' Roses
Shirley Bassey
The person who sings the song in the "Dreams" bed advert is Roy Orbison
sounds like natasha beeddingfield to me?
I think it's Priscilla Ahn No it is is One Republic Love Runs Out. A great song