Cool photo. There were also some taken of the same area in London around the London Eye a year ago.
http://www.thesun.co.uk/sol/homepage...icle857527.ece
The person that took them was taking photos with her cellphone and only saw the ufo in the photo afterwards.
They seem to be common around that area. No surprise, as it it where the British Parliment and Buckingham Palace is. I wonder what they get up to? Spying on the UK's decision makers or meeting with them in secret.