58.5% of British music buyers only buy CDs

"In 2011? Yes, according to trade group BPI, which just released the stat as part of its 'Annual Yearbook'. Actually, the 58.5 percent figure is for 2010 and also includes some fringe physical formats, though CDs easily dominate this category.  "Taken as a whole, 58.5 percent of music buyers bought physical formats only in 2010, down from 65.8 percent in 2009," the BPI shared.    
Looks like the CD is a slow-leaking balloon.  But on the flip side, 17.2 percent only purchased digital formats, up from12.4 percent in 2009.  And, 24.3 percent of buyers mixed-and-matched their formats."  

Source:  Data from the BPI Annual Yearbook, reported by DigitalMusicNews, 16th May 2011

Note - more data and a great chart at the DigitalMusicNews site