A codifying Act gathers all the law (both common law and statute law) on a particular subject or matter and re-enacts it in new statutory form. This is useful when the legislature wants to reorganise and clarify what has become a complicated area of law.
An example is the Sale of Goods legislation, which codifies the older common law rules on the sale of goods.
In the case-study the facts do not suggest that a codifying Act would be appropriate to implement the government's new policy.