Though not quite where I want the 15mm Ruined Shop with Passage, I wanted to check that the process I was planning or my 15mm buildings was going to look effective, so I gave the ruined end of the model a a wash of Citadel Shade: Agrax Earthshade.
I am quite pleased with the end result with using the wash, the roof tiles look a lot better, as I did that that the Terracotta was a little too bright when I first painted the roof that colour.