This HUGE bee was all afternoon in my mums garden…but not flying into the flowers for pollen - but digging holes in her lawn. Bizarre. Not sure what breed it is - it was massive and it’s markings were amazing (stripes of black, gold, black then grey/beige bottom). I’ve no idea why it kept trying to go down holes in her lawn - bees don’t eat ants do they?!! 
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Could be a ground nesting bee, though this one looks a bit chunkier than ones in the pictures here:
https://www.wildlifetrusts.org/blog/ryan-clark/guide-solitary-bees-britain
Eating well, perhaps.
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