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If they are the small geometry type you'll have fewer problems because there's less likelihood that they'll be bridging flexible joints or have to flex across their surface.
I still don't see the need for the thin ply on top of everything else, it's usually necessary for thinner vinyl tiles which have thin adhesive and show any imperfections in the subfloor but the adhesive adjusts for small undulations in the surface when you are using a harder/thicker tile. Use a flexible adhesive and grout too.
I wish I knew. There's a big section that goes across 3 rooms.
Whilst now it's a garage with house above once the ground floor was the stable and the first floor a hayloft
It's the hallway that I'm tiling, with a nice Victorian geometric pattern. Bit too upmarket given the house's history but they looked so nice :-)