American musicians Ke$ha and Pitbull claimed the first British number one single of 2014 on Sunday, after their collaboration "Timber" racked up above-average sales for early January. The newly-released single sold 139,000 copies to knock "Happy" by Pharrell Williams off the top spot and into second place, the Official Charts Company said. Chart-toppers Ke$ha and Pitbull have each held the number one title twice before with solo singles or collaborations, but neither had hit the number one spot for more than two years until Sunday. Avicii and Jason Derulo held on to third and fourth places respectively while British singer Ellie Goulding climbed to fifth spot with her charity single "How long will I love you".