What is the highest-certified Pink Floyd album in the United Kingdom according to the BPI?

That would be The Dark Side of the Moon, which the BPI has certified 9× Platinum (meaning over 2.7 million units shifted in the UK alone). It’s the fourth best-selling album of all time in Britain, behind only Greatest Hits by Queen, Sgt. Pepper and Gold by ABBA.

The BPI’s certification system uses 300,000 units for Platinum, so 9× Platinum is a rare feat. Only three other albums have ever reached that level in the UK. The Wall sits at a distant 3× Platinum, making Dark Side Pink Floyd’s undisputed domestic champion.