Localism Bill

Could the noble Lord explain how his amendment would affect, for example, the situation where, a councillor at a committee meeting having argued very strongly on one side but the party group having met and decided collectively on a different position, the councillor then says, when approached immediately before the council meeting, ““I am changing my vote””, and, when asked why, says, ““That was the decision of the group and I accept it”” and then goes into the council meeting and votes in accordance with the decision of the group? How would the amendment address that issue?