The Bee Fly is common throughout most of Britain and spends most of its life hovering and feeding on nectar. The females flick their eggs down the entrance holes of Solitary Bees and Wasp nests. When the tiny larva emerge from the egg they find their way to the Bee/Wasp larva and feed on them.
A very freshly emerged Bee Fly warming itself up in the sun
Bee Fly feeding on Cuckoo Flower [also known as Lady's-smock]