I saw something that evening too!
I noticed it about 45-50 degrees up from the horizon due west, and it travelled due east until about 85 degrees where it faded from view. I'm located in Sussex about 4 miles south of Gatwick Airport. It was getting dark but not yet fully dark, around 9:30pm but I can't be 100% sure of the time now (I made a mental note of the time to check the location of the ISS, Iridium, etc., but then promptly forgot until I read this).
It was bigger than a typical meteor, but not as dramatic as a fireball meteor. I have seen the ISS from this location before and it was similar in perceived size to the ISS with the shuttle attached, but less distinct (when I saw the ISS I could just about see some structure at closest point of the pass). It was also moving slower and did not seem to speed up noticably as it raised in elevation (i.e. got nearer!), unlike the ISS which did. It was undramatic to me but something about it did catch my attention, which living near an airport is unusual. Although I have looked for random satelites before and seen the ISS with the benefit of a time table, I have had no definate satelite sightings from here before other than the ISS (and the moon!).
My assumption was that it was a satelite or aeroplane at highish altitude (we get a lot of lower ones being near an airport and it did not seem to be one to me). I did not see any flames, fragmentation, or anything falling straight 'down', but I'm in a well light polluted urban area. I would have dismissed it as an aeroplane except the way it vanished at high elevation in the same way the ISS did (and no flashing lights), which suggested to me that it might have been a satellite moving into the Earth's shadow, especially given the time of day. I assume someone would have mentioned if a large or well known one was expected to have passed over at that time.
I'm facinated by the possibility of it being something re-entering, or debris, or even an early Persiud. Talking of which, I'm off to watch some of the latter right now...
I would love to see the video, btw.