The police helicopter is making circles overhead- as it does sometimes. Noisy, bloody rattletrap! I assume it's watching the traffic on the A21.
Talking about flying rattletraps, the Estorick gallery in North London is currently hosting an exhibition of work by artists and photographers who were also airmen in the Great War. Sydney Carline is a name that has been forgotten and shouldn't have been. This image is suddenly all over the media. It shows British scouts (in Sopwith Camels, I think) leaving their aerodrome and flying over the Asiago plateau in Italy in 1918.
Here's another of his. It shows a British plane flying over the desert in Mesopotamia in 1919...
Carline died young- not in combat or in a flying accident, but from pneumonia- which developed after visiting his fellow artist John Nash on a particulary cold evening in 1929.