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A male given the pale ventral surface and knobbles on the antenna. Unlikely to get a firn species level ID.
There are up to date keys for the continental fauna, which can be used to identifiy Lasioglossum, but you would need a specimen rather than a photo, since fine details of sculpture are important, and knowledge of German or French. Amiets in the Fauna Helvetica series, etc.
Blimey! A difficult id challenge by the sounds of it :-)
I think one day we will be able to do more species from photos as the photos get more detailed and more 'field' characters are noticed. This happened in birding as optical gear got better and now with instant high quality photos - so we don't have to shoot birds and measure their hind claws any more. In fact with the apparent rate of progress on some bee keys, detailed photoguides may end up being ready first!
Jamie from Briantspuddle
It would be nice to think that halictids can be identified from field photos, but the reality is not there yet.
For halictid bees fine details of several characters from multiple angles are required for many species identification which would require something better than even a good field photo.
For some dissection is required too, which is not possible from a field photo.
This means that accurate identifications will in many cases be only possible from dead specimens so that it is still and correctly arranged, and examined under a microscope will be needed to see the characters.
Dead specimens are of course valuable as vouchers which can be reexamined in future if there is any doubt over the identification.
Lat/Lng: 51.3874, -0.154
OS grid ref: TQ285669