LiveNation has offered an explanation for why the Springsteen gig was cut short:
"It was unfortunate that the three hour plus performance by Bruce Springsteen was stopped right at the very end but the curfew is laid down by the authorities in the interest of the public's health and safety. Road closures around Hyde Park are put in place at specific times to make sure everyone can exit the area in safety."You've got to love the "three hour plus" bit there - you can almost hear the sighing of "how much more did you want?" - but the suggestion that letting them get to the end of Twist And Shout would have meant the road safety measures would have been torn down seems a little unlikely.
Presumably the real reason would have been fines from Westminster City Council?