Well, thanks, Peter, Lois and Glen.
Let's face it Peter, if it wasn't any good, I would not have posted it. It takes a while to get an idea of how mulitiple image shots will look, especially when the subject is moving or the camera itself. And the results are not always predictable, even with experience.
Lois, I don't think you need my advice on such images. You have many lovely images yourself. But, I will pass on that you try a range of 1-2 seconds per shot, as this seems to produce a good combination of motion blur and recognizable subject-matter.
Glen, I have many similarly fine images, but this is the first time I was able to produce in-camera without a sandwich, results that good, and/or acceptable on more regular basis.
Thanks all for the comments.