Changing the nature of a Neighbourhood Plan - Public forum - Planning Advisory Service (PAS)

Hello. Does anyone have any examples of changes to a neighbourhood plan that would 'change the nature of the plan' please? The PPG gives the example of allocating new sites for significant development - our 2nd Ed NP (currently at Reg14) doesn't do this, but it does introduce new policies - would they constitute a change of the nature of the plan? Just trying to find some examples for when I ask the QB for their statement as to how significant they think their changes are. Many thanks