PPS 6 Planning Archaeology and the Built Heritage·Page 28·6.19
Historic Advertisements and Signs on Listed Buildings
Existing signs or advertisements on listed buildings that have historic interest or artistic quality will normally not be permitted for removal or significant alteration.
Many listed buildings are in commercial use and already display signs or advertisements of some sort. These in themselves may be of historic interest or of some artistic quality, and where this is the case the Department will not normally permit their removal or significant alteration.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 6 - Planning Archaeology and the Built Heritage.pdf