The Official Chart, broadcast on BBC Radio 1 and MTV Official UK Top 40 , is the UK music industry's recognised official measure of singles and albums popularity because it is the most comprehensive research panel of its kind, today surveying over 15, retailers and digital services daily, capturing The OCC website contains the Top chart. The chart week runs from Friday to midnight Thursday,  with most UK physical and digital singles being released on Fridays. From 3 August until 5 July , the chart week ran from Sunday to midnight Saturday. The UK Singles Chart began to be compiled in The company regards a selected period of the New Musical Express chart only from to and the Record Retailer chart from to as predecessors for the period prior to 11 February , where multiples of competing charts none official coexisted side by side.
They're the very top of the pops — the UK's million-selling singles, the tracks that have achieved one million paid-for sales, whether they be physical singles or downloads. It's still a relatively rare feat, with currently only songs making it to seven figures. Not all of them managed to make it to Number 1 — 28 million-sellers never hit the top spot — but they've earned their place in British pop history. Way out in front, with 4. The top selling song released in the 21st century goes to Pharrell Williams' Happy, which is eighth with 1. Cher's Believe, the best-selling song by a female artist, is 17th in the rundown, with 1. Frankie Goes to Hollywood's Relax claims the best-selling debut single by a group 2. Some stars are just greedy and bag more than one million-seller: 22 acts have two or more entries in the list of the UK's all-time bestselling singles.
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We present to you a ranking of the greatest UK No 1 singles since the charts began in The only rule was that an artist could only feature once. As such, it is very much open to discussion, which we heartily encourage in the comments section. Also, note that dates listed are the dates the songs reached No 1. As much a generational bellwether as a pop classic.