A rather attractive fly, which I think is probably a Tachinid. I'd swapped lenses, but forgot to change the shutter speed, hence it's a bit blurred.
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One of my favourite flies!
They like to be near buildings. There's a hop vine and some garden furniture near outbuildings where I've seen them all summer, often all day long
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There are farm buildings just across the Great Raveley Drain from where it was seen.
Lat/Lng: 52.4515, -0.1889
OS grid ref: TL231852