Southampton Black Triangle (Two Clips)

This one is actually quite interesting. It's a black triangle hovering in the sky over Southhampton.

http://www.youtube.com/watch?v=z4b1oSQ6IH8

This footage is eerily similar to the cell phone footage shot by a driver:

http://www.youtube.com/watch?v=coqFQncy0qs

In the beginning of the second clip, you can barely make out something sticking out of the bottom of the object. This same appendage is clearly visible in the first clip.

Unfortunately neither clip shows the object move in a manner that would suggest it's controlled, so it's tough to say. Could just be a balloon or a kite.