Can the external boundaries of the parish, district or county change?

Not as part of an electoral review. For parish boundary changes, the local district council can conduct a review and implement the recommendations, under the provisions of the Local Government and Public Involvement in Health Act 2007. We can conduct boundary reviews of district or county councils, either at the request of the Secretary of State, at the request of the relevant authority or if we identify boundary anomalies which in our view warrant a review.