<P> The record for most non-consecutive weeks at number one is 18 by Frankie Laine 's `` I Believe '' in 1953 . It spent nine weeks at number one , dropped down for a week , returned to number one for six weeks , dropped down for a further week and returned to number one for a third time for three weeks . It is one of five singles to return to number one more than once , the others being `` Singing the Blues '' by Guy Mitchell in 1957 , `` Happy '' by Pharrell Williams in 2014 , `` What Do You Mean ? '' by Justin Bieber in 2015 and `` Despacito '' by Luis Fonsi and Daddy Yankee featuring Justin Bieber in 2017 . </P>
what is the longest running uk number 1 single
Frankie Laine 's `` I Believe ''