According to The Telegraph:
A Spitfire and a Hurricane flew high above London’s Westminster Abbey to commemorate the battle, one of the turning points of the Second World War.
Some 544 Royal Air Force pilots were killed in the bitter struggle to save the UK from invasion.
Of the events, Winston Churchill famously declared: “Never in the field of human conflict has so much been owed – by so many – to so few”.
The annual service marked the nation’s gratitude for the pilots and aircrew of the RAF who prevented Germany from gaining air superiority in the summer and autumn of 1940.