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Thanks for the more likely ID. I suppose the fact that it was on the wall should have given me a clue!
Happy to help! This species is quite easy to encourage, it will nest in the commercially available nest boxes or cheaper alternative, a bundle of garden cane sections placed in a sunny sheltered place. They are quite tame/non-aggressive and easy to observe coming and going, also their nest parasites. Leaf cutter bees which are related will also nest in these situations. As well as being attractive Red mason bees are good pollinators for fruit trees. An excellent book was written about this species by Chris O'Toole. Regards, David
Lat/Lng: 50.6, -2.5
OS grid ref: SY6778