<P> Since the incorporation of streaming into the singles chart, the Official Charts Company have continued to compile a sales only chart . In week ending 27 April 2017 "Sign of the Times" became the first number one in the sales only chart to sell less than "No Tomorrow" by Orson, with 16,686 copies . </P> <P> Since the inception of the UK Singles Chart in 1952 only four acts have replaced themselves at the top of the UK charts with exactly the same billing (as opposed to any named artist, for example' Cliff Richard and the Shadows' and' The Shadows' have had back to back number ones on four occasions): </P> <Ul> <Li> The Beatles--"I Want to Hold Your Hand" replaced "She Loves You" in 1963 </Li> <Li> John Lennon--"Woman" replaced "Imagine" in 1981 </Li> <Li> Elvis Presley--"One Night / I Got Stung" replaced "Jailhouse Rock" in 2005 </Li> <Li> Justin Bieber--"Love Yourself" replaced "Sorry" in 2015; "Despacito" replaced "I'm the One" in 2017 </Li> </Ul> <Li> The Beatles--"I Want to Hold Your Hand" replaced "She Loves You" in 1963 </Li>

What is the longest time a song has been number 1