Major-General John Vaughan describes Nannau in his war memoirs, “Cavalry and Sporting Memories”, published in 1954:
“Nannau is about the best built Georgian house I have ever seen. With huge blocks of stone and round, pointed and projecting mortar. Incidentally, I cannot find out the composition of the cement but I have been told that it was burnt lime, fine river sand and bullocks’ blood or white of eggs. It is previous to Portland cement. All the stone was, of course, hand dressed and the interior woodwork and ceilings are a monument to the old Welsh craftsmen, who have now entirely ceased to exist”.
He describes the estate as “one of the most beautiful in the United Kingdom.”