Thanks guys. The ISS goes red as it fades into shadow, something I've noticed a few times before.
The video is effectiviely sped up about 7 times (recorded at 4 fps to get a decent exposure and played back at 30 fps). I used the Magic Lantern firmware to enable the longer exposure during video on the 600D. The fast moving object at the end is a jet aircraft flying past.
Here is a slowed ("only" 3.5x speed) version of just the ISS pass:
http://www.youtube.com/watch?v=795ds...1&feature=plcp
Tom