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It could be an old one which would explain the absence of hair on thorax & thin abdominal hair, but i would favour Osmia rufa.
I do get confused between these two species! Thanks for your observation.
Certainly worth looking at these pages: http://22.214.171.124/index.php?q=content/beginners-bees-wasps-and-ants
Lat/Lng: 51.4729, -2.587
OS grid ref: ST593750