Some European copies had a different B-side, such as Germany, which featured "The Iron Dream" instead.
The single version was subsequently included on the 1980 Repeat Performance compilation album.
Brock declined to appear, either being unwilling to drive to Manchester for the filming or holding a long time grudge against Bolan.
In 1994, Hawkwind recorded a new version of the song with significant rewriting of the music.
A new acoustic version of "Quark, Strangeness and Charm" was included on The Road to Utopia (2018), produced and arranged by Mike Batt with additional orchestrations.