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How long was this fly? The only thing that comes to mind at the moment is genus Anthomyza, but they are tiny (2-3mm). (I'm not sure the venation is quite for Anthomyza either.)
Entomologist and biological recorder
Put it up in Diptera.info, will update should I get any feedback.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
Lat/Lng: 53.2053, -0.5667
OS grid ref: SK958685
Backies Wild Flower Meadow, Boultham Moor, Lincoln