Absolutely of no help to you at all but I've just chiseled a whole load of those in brown of the walls of an en-suite & bathroom I'm currently renovating for a customer. Their property is around 10 years old so you may have problems finding them.
Sorry skips gone I'm afraid but they were so well stuck on, not many of them survived & took most of the plaster with them; I had to fully re-plaster both rooms before re-tiling. The house is on one of those trendy mews estates popular with the large developers.
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