However, a few minutes in the garden did produce 11 Black-headed Gulls flying north, while Herring and Lesser Black-backed Gulls, and three Buzzards were all soaring.
One or two Brimstones flew past, and several bumblebees also failed to stop. In fact the only thing that hung around long enough to get photographed was this fly.
A little research has led me to the conclusion it is a species of Cluster Fly, Pollenia sp, possibly Pollenia rudis. However, it appears that the UK Cluster Flies of that genus cannot be safely identified without the aid of a microscope.
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