During one of our recent sunny spells, there were a couple of Dark-edged Large Bee-flies, Bombylius major, zooming around the garden.
These have to be the cutest flies around, they have fat fluffy bodies, silly looking droopy skinny legs and ridiculously long prosboscises for drinking nectar. These particular bee-flies are identified by the dark pattern on their wings. They have a very swift darting flight and are very difficult to photograph! They do not sting and are not associated with spreading disease to humans, so you can enjoy them.
They lay their eggs in the nests of solitary mining bees and the bee-fly larvae will then feed off the bee larvae, in a case of fly stings bee.
If you spot one then you can record your sighting at the BRC website here.