I was driving towards home, I looked up to see the full moon, spotted a large cylinder passing through the clouds overhead.

Driving back to my house it now gets darker earlier. I looked up at the almost full moon. Between the clouds, it was very good visibility, with the night sky , stars were bright and clear. To the left of the moon the cylinder, it passing through clouds a large gray?/metal? cylinder passed in the opposite direction of my travel. Straight over head, back behind me heading south towards Gatwick. It looked like it was slightly lighter than surrounding cloud as if reflecting light from below. Straight line, steady pace, fast. No other features were visible.