Who Built The Moon? is the 15th different No.1 album in as many weeks, and its release helped prevent Little Mix's fourth studio album Glory Days from returning to No.1 a year and a week after debuting in that position, following the release of a new Platinum Edition of the set.
Surging 46-3 on sales of 38,576 copies, Glory Days’ expansion sees it adding CNCO collaboration Reggaeton Lento, a trio of new songs and a documentary DVD. It edges past Get Weird to become the Little Mix's biggest-selling album. Its cumulative sales stand at 747,211, with Get Weird – their third album, released in November 2015 – on 745,658 sales.