Local Government and Public Involvement in Health Bill

My understanding is that an election would take place under the normal system—two or three-member wards, say—and that a council would then decide that it wanted to change to single-member wards, which would reduce the ward size by one-half or one-third. If that review was undertaken, presumably the change in the wards would not come into force until the following election time. What impact might that have on the nature of representation? Presumably, the way that the ward boundaries are formed could affect the make-up of the local council.