Watched the 2141 pass from Central London (well Highbury - more or less Central London) - very clear and bright, and thought I could make out a slightly less bright shape attached to the main ISS - although it might have been a smuge on my glasses...
I've seen satellites and meteors before, but never the ISS/shuttle - it really sent a shiver down my spine to see that we're actually out there. Thanks to the OP for the heads up.
And I agree with the other comments, it really does shift!