It is the Begby special. A beautifully constructed little machine and a real credit to its owner/builder. Sorry cant provide any more details but someone will know.

Another machine that took my eye, not because of its beautiful construction, but because its inlet manifolds were made from house-hold plastic waste pipes!!!!!!!!!!!Have never seen such a thing, and am surprised that it passed scrutineering. It was supercharged, and had a long and convoluted inlet from the blower, through a heat exchanger [I think] and eventually to the head. There were a lot of twists and turns and no doubt easy to construct with waste pipe, but................. ............ The pipes were paint black to confuse armchair critics.