The War Memorials Project is keen to see more war memorials included in the National Heritage List for England. Listing highlights a building or structure's architectural or historical value, and ensures that this is taken into account if and when any changes to the memorial and its surroundings might be considered. Any significant changes that are to be made to a listed building require listed building consent. It is a criminal offence to alter a listed building without listed building consent.
Many memorials are associated with churches. A separate system of control exists for alterations to fabric or fittings relating to ecclesiastical buildings. For more information, see this article on the subject.
FAQ's
Further Information on Listing War Memorials
The War Memorials Trust also encourage the listing of war memorials. You can see their web pages and helpsheet on listing on their website.