Union jack flag flies in Parliament Square, outside Westminster Abbey, during the marriage of Prince William to Kate Middleton, 29th April 2011, London, England, United Kingdom, Europe

Union flags and spectators outside Houses of Parliament, during the marriage of Prince William to Kate Middleton, 29th April 2011, London, England, United Kingdom, Europe

Crowds standing in the Mall outside Buckingham Palace on the day Prince William married Kate Middleton, 29th April 2011, London, England, United Kingdom, Europe

Appearance on the balcony of Buckingham Palace, Marriage of Prince William to Kate Middleton, London, England, United Kingdom, Europe

Appearance on the balcony of Buckingham Palace, Marriage of Prince William to Kate Middleton, London, England, United Kingdom, Europe

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.