Snow Patrol's album Eyes Open could be the biggest-selling album of 2006, according to HMV.
Based on sales to date, Scissor Sisters's Ta Dah is in second place while Whatever People Say I Am, That's What I'm Not by The Artic Monkeys is in third spot.
Albums by Razorlight, The Kooks, Take That, Oasis, Westlife, James Morrison and Pink complete the top 10.
HMV's Gennaro Castaldo comments: "Looking back, it's been a bit of a golden year for British music. Prompted by the amazing success of the likes the Arctic Monkeys and Razorlight, indie, rock and pop continued to dominate the music landscape.
"The best kept secret of the year, however, was Snow Patrol, whose acclaimed album Eyes Open will have notched up the best part of 1.
5m sales. The Kooks, too, had a remarkable year, seemingly coming from nowhere to enjoy a million-selling album.
"It was also a year of new artists coming to the public's attention through the power of the internet - Lily Allen, Sandi Thom, Paolo Nutini, James Morrison and, of course, the Arctic Monkeys, were pretty much unknown, but through chat rooms and social network sites such as My Space they burst onto the music scene to enjoy immediate and unprecedented No 1 success.
