Moira's loss is my gain and it gives me a chance to post a picture of one of my favourite aircraft - aaaaaaaah! de Havilland.
Where was this low flying taking place (notice the two men ducking)?
Edited to add that this is a very impressive photo - the Mossie is very sharp, considering the high speed.
Further edit - the sharpness intrigued me, so I did some measurements. The tip of the port prop has moved through about 25 degrees. Assuming 3000 rpm, this gives a shutter speed of slightly slower than 1/1000.
So I'm guessing the shutter speed was either 1/500 or 1/1000. The lack of helical distortion of the prop blades implies a focal plane shutter. Leica anyone?