And here's another one I tried, as I thought I'd have more room in the frame. I'm actually in front of the camera on this one. Fortunately I had a shot of the backgroud that was taken before anyone appeared in the scene, so I was able to use that as the background and then move the figures on all of the subsequent layers back a bit. As you can see, however, we got the shutter speed (even though the camera was on sports mode, I think) and so all of the movement is blurred. Although I think this adds a little of effect when put into sequence I would much prefer crisp clean shots. For future reference I think it will help to get clear of the snow a bit too, like on the rail pics, as the sprays of snow make moving the images about quite difficult.
Still, at least I know the technique to try again next time.