California poppy with attendant solitary bee

This morning, I went on a workshop for FIT Count (Flower-Insect Timed Count) for the UK Pollinator Monitoring Scheme. The idea is that ordinary folk do 10-minute count on a 50cm square patch of common flowers (like dandelions, buttercups, white dead-nettle etc.) and count the number of visiting insects, to the level of groups, like honey bees, bumble bees, beetles, butterflies and so on. I wasn't counting this one (Californian poppies aren't included in their flower types), just photographing it and trying to identify it. It is a solitary bee, and I reckon it is a male Adrena labiata - about 5mm long. But it's a tricky business, what with hoverflies mimicking various bees and wasps to avoid being eaten! The database that will be built up should provide a very realistic picture of pollination patterns and how they are falling.