Current state of top 10 biggest selling albums in the UK:

01 GREATEST HITS – QUEEN (5,863,000)
02 SGT PEPPER'S LONELY HEARTS CLUB BAND – THE BEATLES (5,044,000)
03 GOLD: GREATEST HITS – ABBA (4,989,000)
04 WHAT'S THE STORY MORNING GLORY – OASIS (4,517,000)
05 THRILLER - MICHAEL JACKSON (4,248,000)
06 BROTHERS IN ARMS - DIRE STRAITS (4,152,000)
07 THE DARK SIDE OF THE MOON - PINK FLOYD (4,114,000)
08 21 – ADELE (4,020,000)
09 BAD - MICHAEL JACKSON (3,959,000)
10 GREATEST HITS II – QUEEN (3,887,000)

source: http://www.theofficialcharts.com/chart-news/adele-overtakes-michael-jackson-in-all-time-biggest-selling-albums-chart907/