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Difficult to get a sense of scale on this one, but it could be one of the very small members of the subgenus Micrandrena - something like A (M) minutula. A bicolor doesn't have strong hair bands like this.
Sorry, I should have given more information here. My recollection is that the overall length was about 7mm.
Lat/Lng: 52.198229, -1.546443
OS grid ref: SP310556