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Many thanks Berka. Your input helps me be surer these are A. cineria. I believe A.vaga is rare in the UK and only known in the far south east (http://www.bwars.com/maps_bees.htm), while my sites are in the southwest of the UK, where A.cineraria is often reported. And maybe A.cineraria has more of a black band on the thora than A.vaga x from what I've read.
Nick