Despite the gloriously crushing blow delivered by Rob Reiner and his This is Spinal Tap associates, the rockumentary remains in a rude state of health. In recent years, we’ve seen everything from the Brian Jonestown Massacre’s Anton Newcombe sending personalised shotgun shells to his musical rivals (DiG!) to the struggle by Metallica members to escape adolescence – two-and-a-half decades late – by means of a $40,000-a-month therapist (Some Kind Of Monster).

One thing we haven’t seen, however, is a band playing in a tearoom to grandchildren and grandparents. Nor at a traditional “Thorrablot” meal to a group of pagans. Nor outside a dilapidated farm building, to no one at all, save a few passing animals.