My bathroom looked very like that after I started investigating why a Jews Ear fungus had popped a tile off the wall when we'd been away for the weekend.
After I'd removed everything damp, removed ALL the plumbing (including all the bits that had been leaking into the floor and walls) I rebuilt with an enamelled steel shower tray, and stud walls faced with cement board, onto which I tiled. And replaced all the plumbing with stuff that didn't leak.
My bathroom looked very like that after I started investigating why a Jews Ear fungus had popped a tile off the wall when we'd been away for the weekend.
After I'd removed everything damp, removed ALL the plumbing (including all the bits that had been leaking into the floor and walls) I rebuilt with an enamelled steel shower tray, and stud walls faced with cement board, onto which I tiled. And replaced all the plumbing with stuff that didn't leak.