(MUFON Submitter 8011)
Unknown Object Photographed over Brentford, London-07-26-07
It has the shape of an anvil. I noticed it only while scanning the picture on my computer. The photo was taken with a Nikon digital camera Coolpix S3.
It was on the same day when I had another object on the photo taken near Twickenham (submitted on MUFON website 9/11/07) just half an hour before.
Source - MUFON Submitter 8011