ufo ? over London Thames Estuary UK 5/2/12

ufo over london thames estuary seems too bright for a boat but I could be wrong and looked like it was above the water.It was a very long way off and I was at full 40x zoom hence the shaky footage.I had to eventually leave because of where I was parked . I always carry a camcorder in my car as saw something a few years ago and think more people should be looking and keeping cameras at the ready .