Welsh singer Duffy has secured a U.K. chart double after her debut album went straight to number one. The soul newcomer also held on to the number one spot in the singles chart with her track Mercy for the third week running. H Two O featuring Platinum took second place with What's It Gonna Be while Nickelback remained in the charts in at number three with Rockstar. OneRepublic's Stop and Stare is at four, with Taio Cruz taking the number five spot with Come On Girl. Meanwhile, in the album charts, Amy Winehouse's Back To Black was pushed back to number two, while Nickelback took third place with All The Right Reasons. Nick Cave + The Bad Seeds entered the charts at number four with Dig Lazarus Dig and Goldfrapp took fifth spot with Seventh Tree.