Tuesday 15 September 2015 4:41 pm

Battle of Britain flypast: The routes 40 Spitfires, Hurricanes and Blenheims will cover to commemorate “the Few” in biggest flypast since World War II

Flypast fans prepare yourselves – this is the big one.

The 75th anniversary of the Battle of Britain will be marked today (15 September) by the largest flypast of Spitfires since World War II, alongside a service at St Paul's Cathedral.

In total 40 Spitfires, Hurricanes and Blenheims will commemorate the series of skirmishes that took place in the skies thousands of feet above the south coast of England in 1940.

Not only that, but there will be a royal guest of honour taking part.

Prince Harry will join veterans of the battle, flying in a two-seater Spitfire from Goodwood Aerodrome in West Sussex.

Spitfire outside @StPaulsLondon #BoB75 pic.twitter.com/i1xN7a0IYj

— RAF Association (@RAFAssociation) September 15, 2015

The planes will fly across the south of England from 12pm over towns that were bombed by Nazi aircraft and the airfields that played such a key role in the battle.

Here are the routes:

Let's hope the sun comes out in time.

In London a service of commemoration will be held at St Paul's Cathedral at 11am. Prime Minister David Cameron and other political leaders will attend along with other dignitaries.

Today's flypast and service are being held on Battle of Britain Day – the name given to the day, on 15 September 1940, when the German Luftwaffe launched its largest and most concentrated attack against London in the hope of drawing out the RAF.

Only around 30 Battle of Britain pilots are alive today. They are known as "The Few" after wartime Prime Minister Winston Churchill said that "never, in the field of human conflict, has so much been owed by so many to so few".