I found this fly feeding on a chair I had just waxed, so I assume it was eating the bee wax.
Its body is no longer than 4mm, with a wingspan of no more than 8mm. It holds its wings constantly outstretched with minute vibrations. At the base of the wing there is a large black bulge that tapers until it meets the body. The head is a sickly yellow with 'typical' fly mouth parts. The lower section of the body is black and bulbous with the underneath paling.
Also it is reluctant to fly, instead it walks with brief rests.
Initially I thought it to be a small flying ant, but the head soon showed this to be incorrect.
In no way would I describe this as an exciting fly, but I have never seen it before.
Apologies for the poor photos and also if this happens to be a common fly of no interest.