Four World War Two aircraft are due to fly over Potters Bar and near Hatfield tomorrow to mark the 75th anniversary of the Battle of Britain.

With about 40 Spitfires, Hurricanes and Blenheims taking off in a series of flights from Goodwood in West Sussex in the biggest gathering of period aircraft since the war itself, one of ten routes is set to pass over Times Territory.

The third of the ten flights is due to leave Goodwood at about 12.10pm, and approach Potters Bar from the Watford area, before passing near Essendon en route to North Weald in Essex.

The day chosen for the commemorative flight marks the climax of the 1940 air victory against Nazi Germany, which was crucial in saving England from invasion.

The flights are organised by the Boultbee air academy, with routes across much of southern England, although they are subject to change if affected by weather or mechanical problems.