Im starting to get on with bed 4 en-suite a bit now although starting to do things slightly out of sync.
The floor here, again which is travertine stone, is affixed before the wall tiles due to the underfloor heating ribbon wire system. This is the mat system from Osma which is rolled out and stuck to the marine ply before having the tiles fixed to this. Do remember always use a flexible adhesive when sticking tiles on any type of underfloor heating – im using the white adhesive that’s for stone & is rapid set as well as flexible – it’s the best option!