More bees

When I visit a garden these days I spend more time looking at the bees than the flowers.  There is one species of honey bee in this country, around 25 species of bumblebee (of which seven are common), and around 250 species of solitary bee. I can spot the honey bees, most of the bumblebees, and some of the solitary bees.  There are plenty of solitary bees I'm not sure about.  To illustrate the variety, here are a few I have seen recently.

Royal Mail has today issued a set of stamps depicting six rare bees, none of which I have seen.  You can see the designs here.