iNaturalist suggests that the mystery fly is a Mottled Thistle Fly (Xyphosia miliaria).
Body length 5-8mm, wingspan 15-18mm, lives in meadows with thistles, hedgerows and woodland edge, fairly common and distributed evenly throughout Britain, usually seen between May and September.
But the Yellow Berberis fruit fly Rhagoletis meigenii has the correct wing pattern. Body length 8-10mm, usually seen July and August.
Body length 5-8mm, wingspan 15-18mm, lives in meadows with thistles, hedgerows and woodland edge, fairly common and distributed evenly throughout Britain, usually seen between May and September.
But the Yellow Berberis fruit fly Rhagoletis meigenii has the correct wing pattern. Body length 8-10mm, usually seen July and August.
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