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The orange scutellum seems unusual, so I'm hoping it's distinctive.

Bosham, West Sussex, UK.

Amongst nettles etc, in shade of mature oak, between wheatfield and deep drainage ditch.

Housefly sized or thereabouts (7-9mm?)

17 May 2012.

Could be Huebneria sp?

(Edit - updated title from "Tachinidae" to "Carcelia tibialis" in response to sd's suggestion)