I first thought this was a fly; flight was direct and not moth-like. Width of field of attached photo = 25mm. Is the picture clear enough for identification? It was photographed this morning in central London. Best, Sak
Your first hunch was right - this is a fly of the family Psychodidae, which are commonly called Moth Flies or Owl Midges on account of their mothy/fluffy/feathery appearance (and also Drain Flies as their larvae feed well on the decaying organic matter found in overflows and drains). One of the commonest species in and around our homes is Psychoda alternata; although your image does not look dissimilar so many species look pretty much the same. Perhaps one of our resident fly specialists will be able to provide a species name?