Battle of Britain 'Hardest Day' flypast

Aircraft including 18 Spitfires and six Hurricanes have been flying over south-east England to mark 75 years since the Battle of Britain's "Hardest Day".

The event recalls 18 August 1940, when Bromley's Biggin Hill and other South-East military bases came under attack from the German Luftwaffe.

It became known as the "hardest day" as both sides recorded their greatest loss of aircraft during the battle.

Here is footage of the planes leaving Biggin Hill airfield for the commemorative flight.