Crowds at Buckingham Palace are treated to a surprise performance.

 "Tourists lining the Palace gates expecting to see the Changing the Guard ceremony were taken aback when dancers rose from the Queen Victoria memorial and began slapping their knees and clapping their hands.
Starting with just four dancers, the group quickly grew, with performers emerging from all corners of the crowd as bystanders looked both delighted and bemused.
The dancers, mainly students from the University of East London, clicked their fingers, stamped their feet and shook their bodies to a mix of funky beats including Queen's We Will Rock You and popular dance hit Show Me Love.

Video: Buckingham Palace tourists surprised by royal 'flashmob' - Telegraph