It's holiday season for aliens again as there are further UFO sightings in Streatham. Not only that but the video evidence from a previous sighting mysteriously disappeared from YouTube. Before you reach for your tinfoil hat while humming the theme tune from the X-Files, remember that according to the British National Archives UFO files, sightings increase when sci-fi films are released. Strange, that. London seems to have gone UFO-crazy this year with curiously-shaped objects being spotted in the sky all over the capital and even David Cameron promising to share any alien secrets with us when he becomes PM. Take us to your party leader.