The film opens in the UK and India on Friday, October 8. It will release on Christmas Day in the US.
Exuberant dhols bashed out the intro and hammered out the end of the event. London crowds thoroughly enjoyed the garish, bright spectacle.
The audience was even witness to the crew's lucky coconut, carried sacrosanct from continent to continent during filming, being finally smashed to pieces on stage by the producers.
Javed Akhtar and wife actress Shabana Azmi at the premiere.