I often look at the excellent webcams of London site to help me decipher cloud types and amounts for my 9am GMT observation. This evening I discovered that the timelapse of the last 24 hours included a very interesting white light floating past the Shard.
At limited resolution it is difficult to see what the object is. My suspicions that a UFO had been captured were quickly shot down with the help of Twitter including the excellent
My UFO was the Moon!