Some interesting (I think) facts from my Guiness Book of UK Hit Singles.
Elvis was the act with most weeks in the charts in 5 different years - 57, 58, 61 and (suprisingly I thought) 70 and 71. The Beatles only managed this feat once, in 1963.
For most weeks on chart in each decade Elvis was 1st in the 50's and 2nd in the 60's. (Cliff was 1st and Beatles 3rd). Elvis also topped the 70's, but thay might have been because of his death.
All up Elvis has had the most hits (109). Beatles clock in at 28th (again skewed by Elvis's longer career).
Elvis is also 1st with the most top ten hits, Cliff 2nd and Beatles 3rd. (longevity again)
Elvis just wins with most weeks at number 1 (73 to 69).
Lies, lies and damn statistcs (or something like that.)