According to The Telegraph:
Before the King’s Troop arrived in Hyde Park, the Band of the Royal Artillery played a selection of celebratory music close to the firing position, as crowds gathered to watch the annual display.
An hour later, the Honourable Artillery Company began firing a 62-gun royal salute from the riverbank at the Tower of London… Three L118 Ceremonial Light Guns, similar to those used operationally in recent years in Afghanistan, were used…
The Queen has two birthdays – her actual one on April 21 and her official one in June, which is celebrated with the Trooping the Colour parade.
To read the entire article in The Telegraph, please click here.