Primo Carnera
I saw this movie on T.V. as a child (probably around 1959 or 1960) and was struck by the originality and life of it. Only today did it register that the part of the villainous wrestler was played by former heavyweight champion Primo Carnera! His performance was at least as menacing as Mike Mazurky's in "Night and the city" (another British made film about professional wrestling).