The Official Charts Company who measure the success of popular artists in the weekly UK music charts has admitted an error was made last week (ending December 26). 

Radio 1's website is currently displaying a statement explaining the error that says:

"Last night, Millward Brown, the market research company currently contracted by the Official Charts Company to collect sales data, discovered a bug in the weighting software used to compile the charts, which has affected a number of positions in the charts published on Sunday December 26."

Take That were at number 1 in last week's album charts with 'Progress', whilst X Factor winner Matt Cardle spent his second week in pole position with 'When We Collide'. 

Despite the admitted mistakes, the confession doesn't seem as though it will affect the front-runners:

"As a result, the OCC has decided to re-run all of this week's Official Charts. In relation to the Top 40 Singles and Albums Charts, the errors are minimal."