This video has been uploaded from London, England, on May 6, 2012. The sound is like a jet appearing and disappearing again but the author says that there were no jets in the sky that time.
The author’s comments:
I heard the jet fighters. Wow it was loud! Did not see them, my daughter did. Very low she said.
The sounds we are hearing here are the jets higher up maybe? wtf are they doing? Heard the same sounds in Jan. this year. It’s cool babe, you are not going nuts lol xxx