List of UK singles chart number ones of the 2000s
The UK singles chart is compiled by the Official Charts Company (OCC) on behalf of the British record industry. In the 2000s the chart week ran from Sunday to Saturday, and the top 40 singles were revealed each Sunday on BBC Radio 1. At the start of the decade, before the advent of legal music downloads, it was based entirely on sales of physical singles from retail outlets, but in 2005 permanent downloads began to be included in the chart compilation.
Source: Wikipedia
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