Biggest tiles Ive worked with in a while lol. Ripped out existing wall tiles (see job album). The ply underneath was sound but covered in solid adhesive so I overboarded it with 6mm Jacko board (glued & screwed) rather than ripping the whole lot out. All joints sealed with Jacko joint Silicon and taped all joints in the shower area. Johnsons 400 x 100mm tiles, grouted with Mapei Jasmine Ultracolour Plus. The whole of the bath side panel is removeable, with the help of Schluter magnets