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Rex Features
Duffy is expected to climb back into the Top 5 on Sunday following her Brit Awards success earlier this week.
The Welsh singer's debut album Rockferry, currently just inside the Top 20 at number 19, has seen a 66% sales increase following her performance at the ceremony earlier this week.
Kings Of Leon's Only By The Night, which was named best international album, is on course to reclaim the top spot from Lily Allen after experiencing a 50% rise in sales compared to the previous week.
Meanwhile, The Ting Tings and Coldplay each saw a sales surge after performing at the event and are expected to return to the Top 20.
