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List of best-selling singles in the United Kingdom

For the purposes of calculating sales, a single is currently defined by the Official Charts Company (OCC) as either a "single bundle" having no more than four tracks and not lasting longer than 25 minutes or one digital audio track not longer than 15 minutes with a minimum sale price of 40 pence. The rules have changed many times as technology has developed, the most notable being the inclusion of digital downloads in 2004 and streaming in 2014.

Best-selling singles based on paid-for purchases
Until June 2014, only a paid download or a purchase of a physical single counted as a sale. Based on this definition, these are the 50 best-selling singles in the UK. Positions are current . ==Best-selling songs based on combined sales (streaming-adjusted)==
Best-selling songs based on combined sales (streaming-adjusted)
From 2014, streaming has counted towards sales (sometimes called "combined sales" or "chart sales") at the rate of 100 streams equal to one download or physical purchase, although the singles chart no longer uses this ratio. In September 2017, the OCC changed their definition of a 'million seller' to include streaming. Below are the best-selling singles by combined sales of over 1.8 million, based on sales and streaming equivalent, as of the latest data available. ==See also==
Source: Wikipedia ↗
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