Australian infantrymen taking part in the Lord Mayor's Procession march past Buckingham Palace, where King George V was taking the salute. The Lord Mayor's Procession began in 1215, when the citizens of London were allowed to elect a mayor for the first time. The newly elected Mayor was required by the King's charter to make a journey from the City to Westminster to swear allegiance to the Crown. The procession still takes place today; known as the Lord May's Show. It brings together the defence forces, police, Londoners, businesses, charities and livery companies in celebration of London's past and present.
From AWM Website:http://www.awm.gov.au/about/collections/photographs.asp