Simon, you got it right (your googlefu is strong).
John Motton, world class marksman who started out making bicycles and went on to be a world class gunsmith famous for "Motty's paste" (a rifle cleaning compound) which could be found around the world, and his outstanding accurisation work on rifles in the first half of the C20th. Although he was a superior shot, he was often used by the national team as coach rather than competitor, but he did still manage to shoot from time to time with huge success.
His relevance to target shooting is he built the prize rifle for the annual "Kings (later Queens) shot".
My grandfather had a "Motty" which has now been passed down to somebody in absolute total AWE of what the rifle can do, the phenomenal skill of the shooter, and of the gunsmith who made it!