King's Troop salute Prince Philip in Hyde Park

The King's Troop Royal Horse Artillery fired a 41-gun salute to celebrate the Duke of Edinburgh's 91st birthday.

The salute took place at midday today, led by Parade Commander Adjutant Captain John Gibson RHA.

A Royal Salute normally consists of 21 guns, but this is increased to 41 rounds if fired from a Royal Residence or Royal park.

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Prince Philip out of hospital

The Duke of Edinburgh left King Edward VII Hospital in London today in time for his 91st birthday. Prince Philip had been in hospital since Monday, where he was recovering from a bladder infection.