It is Dave Roper. In the full size shot you can see the name Dave beneath the white bib and a luxurious moustache. Admittedly hard to see in the smaller image. This next pic is one of my all time favourites. No elbow on the floor or front wheel five feet in the air, but that sky...It looks photoshopped but that's how it came out at the time. I've tried to recreate it since without the same level of success. So, who is it?