Adele's '21' is UK's biggest-selling album of the decade

Adele’s album '21' is the biggest-selling album of the decade to date in the U.K.
    
The British singer’s sophomore set has sold more than 4.75 million copies in her homeland.
    
The album spent 23 weeks at the UK chart.
    
The recording has sold more than 30 million copies worldwide, following its arrival in 2011.
    
Adele’s 21 was named the best-selling album of the millennium in an OCC report issued in March.
    
There's still no firm release date, or even a title, for her third studio album.