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I believe this is a Muscidae. It has been suggested that the scutellum is deformed - it appears to form a half-cup shape rather than being relatively flat, or tilted.

I initially rejected Tachinidae because the wing venation is wrong. The images as a whole are probably not clear enough to use a key, so I hope someone can recognise the fly.

Size about 5 mm. Seen 04/04/2020, south Cumbria.
More images to follow.