A real intermission this time. The mason and his team came to pour the concrete floor and discovered that there is not enough depth in the centre of the room, so they refused to pour it. Quite right. I don't want my floor and tiles cracking up in a year's time. So the plumber is coming back to lift the tubes and insulation and chisel out a greater depth of floor.
Meanwhile of course the place is still a tip, and still freezing. Good job the weather has been mild.