Slate .900 https://www.metrotile.co.uk/tile-profile/slate-900/ was specified for a heritage property where natural slate was the obvious choice aesthetically but the structural assessment ruled it out on weight grounds. The deep-pressed profile of the Slate .900 replicates the shadow definition of natural slate convincingly — the conservation officer accepted it without objection. Enhanced security from the heavier gauge was a secondary benefit for a rural property. BBA certification made the building control process smooth. A genuinely useful product for heritage and conservation applications where weight is a constraint.