Great image, this is the sort of image that I would assume would look better in colour (because of the colourful clothing and bikes) but I think you have done an excellent job with this. The biker really stands out and is sharp and the blurred background is spot on.
Re: Iron horse Thanks for comments, my first go at panning since I was a kid (then I was shooting Jame's Hunt at formula 1), really like the effect, loads of pin sharp stuff taken at 2.8 but no movement so much prefer this panning to separate subject.