Funnily enough i saw almost exactly the same thing week before last outside my business in Mid-Wales... i just happened to catch a glint of something very bright at about cloud level - looked up and there was something travelling far too quick to be even a fast jet, seemed spherical and as reflective as chrome. No contrail either, unlike two passenger jets at about the same altitude going in the opposite direction.
Watched it for 30-40 seconds or so, it went into a small cloud that was on its own apart from the main cloud base.... and it never re-appeared in any direction, and it was cloud free all around it...
However since then everyone in work ( and a mate here on o0ple... ) has found it highly amusing to keep asking how my Alien friends are, when im popping off for a day trip to Mars and sticking pictures of little green men to the back of my car....
Thank God i havent told them about the treetop high one i saw near Ipswich about 15 years ago....
