McCartney made an impromptu appearance with Springsteen during the headliner's encore and performed Beatles' classics I Saw Her Standing There and Twist and Shout. Organisers shut off the event's sound just before 11, as the performers were about to play one last song, to avoid breaching noise regulations and to get punters out of the venue safely.

In a statement on the Hard Rock Calling website, a spokesperson for Live Nation said: "It was unfortunate that the three hour plus ...