Thirty-two chart weeks have elapsed thus far in 2018, and in 24 of them – 75% – the No.1 album has been a Motion Picture Cast Recording.

The latest such phenomenon, Mamma Mia! Here We Go Again has an easy third week at the summit, albeit with consumption in decline for the first time, falling 12.82% week-on-week to 35,488 units, including 8,256 from sales-equivalent streams.

The Greatest Showman soundtrack, which spent 21 weeks at the summit earlier this year, remains ...