The chart was founded in 1952 by Percy Dickins of New Musical Express (NME), who telephoned 20 record stores to ask what their top 10 highest-selling singles were.
[1] The most successful band (and equal with Elvis based on unique songs) are The Beatles, who have achieved 18 number ones.
[2] During 1992, when few releases were reaching number one, sales of CD singles were low: songs needed to sell only 60–70,000 each week to remain at the top.
[3] UK chart commentator James Masterton remarked in 2003: "When record sales are high, public interest in a song expires very quickly and this creates a need for ever more new product to take its place.
"[3] Sales figures improved in 2008 and continued into the early 2010s, peaking in 2013, before declining over the next few years as audio streaming became popular.