As several others have said, authentic, and decided upon after research. The works to the building have secured it for decades to come so should be applauded.
Plenty of evidence of buildings in Dinorwic with external finish other than bare slate as well:
๐64258[linkphoto]64258[/linkphoto][/link]
๐57198[linkphoto]57198[/linkphoto][/link]
๐39154[linkphoto]39154[/linkphoto][/link]
๐64372[linkphoto]64372[/linkphoto][/link]
๐3356[linkphoto]3356[/linkphoto][/link]
my orders are to sit here and watch the world go by