Crime and Security Bill

I am sure that most people in the House agree that the measure is a very good idea. However, is not the real problem the fact that at the moment prisoners carry out assaults on prison officers and are very rarely prosecuted for it? If they are, the amount added to their sentences is so minimal that it makes no real difference in overall terms. What on earth is the point in passing this legislation if no real sanction is to be applied? Does the shadow Secretary of State agree that sanctions must be heavily applied to those who are caught?