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Thank you :-)
What features do I need to get in photos in future for flies like this? Facial features?
Strictly, the key requires a look at the side of the thorax above the front coxa, which is heavily dusted in solstitialis and glossy in cemiteriorum.
My Flickr photos...
Lat/Lng: 52.5843, -1.958
OS grid ref: SP029984
Former Golf Course, now managed by Countryside Services.