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It is Lasioglossum, but I don't think it is calceatum and you could certainly not be sure from the picture.
Not the response I was hoping for, but one I did expect. Pushing the boat out, I was. You are indeed correct, and I thank you most kindly, appreciated...
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