400mm with noggins, I just checked one of my old pics and they had noggins around the perimeter must've been put in by the house builders.
Cool thanks, I shall fit the noggins!
How do you find the Grohe built in toilet by the way? Are you concerend for if/when it requires replacement/fixing?
Considering looking into them. All I need to buy still is the toilet, sink and the pick the tiles.