Hmm? An interesting one. I would regard using a background in this way as perfectly legitimate. The hand of man is inevitably involved - how do you distinguish between the use of multiple flash-guns and that background? If one goes nit-picking, where does the camera fit into this?
My reading of what I take to be your original regulations would be that image editing would be be proscribed, but detecting light touch editing would not be easy. I would have assumed that the shutter would have to be fired manually too.
Also once you erase the line in the sand, or fail to define it adequately, where do you decide that the limits occur?
I have come across Graeme Guy's work through a fellow member of Royal Forest and Bird, who, whilst an accomplished photographer himself, holds Graeme Guy in reverence.