Review of Is That Your Body, Boy?

I have looked for a reference to this excellent play for ages and I would dearly love to see it again. Ron Moody gave a wonderful performance as the sadistic PE teacher who was merciless in his verbal attacks on the very overweight schoolboy who did not appear to have an athletic bone in his body. Apart from Moody's famous line, the other memorable line from this play, which was uttered on more than one occasion by the boy in question, in his defence, was: "I only held the rope, sir". I remember that the event leading up to the prolonged attack on the boy had something to do with another boy climbing a rope in the gym and committing some prank, the details of which I have forgotten after forty years.