Queen's birthday: Children perform tiny 21-gun salute

Children from Windsor and Maidenhead use little cannons to celebrate the Queen's 91st birthday with a 21-gun salute.

The cannons are just 1ft (0.3m) long, just over 1in (2.54cm) wide and weigh about 12lb (5.44kg).

The Queen's date of birth is 21 April, but her "official" birthday is celebrated on the second Saturday in June.