South Africa have been associated with three ball-tampering offences in nine months. That all incidents have passed with little fuss shows that the ICC needs to enforce stricter laws to prevent it from recurring
Ball tampering should be allowed since as far as I am concerned it don't make a whole lot of difference.
BUT what should happen is that the ball should NEVER be changed unless the stitching has opened up. Bowlers complaining about ball out of shape is pure foolishness and umpires checking roundness with special instrument.
During the current India/England test Holding say he nah care bout shape of ball. His only concern would be if the stitches came loose.