UFO Over Kent UK Yesterday

This is an interesting photo, whatever it is.
I also think that capturing decent, clear, photos of 'ufos' is difficult evan today with the camera technology we have, as well as the camera phone boom. This is because after watching documentaries like 'Evidence- The Case for NASA ufos', and 'UFO The Greatest Story Ever Denied'; it seems like many ufos in space and on earth, cannot be seen with the naked eye and our cameras. Many ufos only show up in the ultra-violet/infra-red light spectrum.
Something to think about I feel.

By the lights I saw in the sky the craft I saw seemed to be military, it was flying a bit faster than the average jet but being a night time flight all that could be made out were the lights on it! Strange shape and light layout.

AlexZ_UK make a good point, but as said "most", so there is a chance that there are some that can be seen.

It wouldn't surprise if they have cloaking devices, such as seen on Unsolved Mysteries: The UFO Files.