I'd love to know your choices. This year I have planted some flowers apparently loved by bees, such as nemesia, but they have been roundly ignored. I guess there is always going to be trial and error for each garden.
So you found one then @LeadFarmer. Is it a general one for insects rather than specifically bees? The holes look small.I have last year's batch of mason bee cocoons in my shed ready to hatch in Spring, and am stupidly excited to see them emerge (obv I am praying not to be disappointed!).