Assaults on Emergency Workers (Offences) Bill

Before my hon. Friend moves on to new clause 2, I want to raise a query about new clause 1. My reading of the Bill, particularly clause 3, is that it would cover an assault on a police officer. Does he not believe that prosecutors would look to charge under this Bill? Why is it necessary to amend the old legislation if the Bill will be available to a prosecutor in an appropriate case?