Not an ensuite. Not with a wall dividing it. Not even a glass screen. I've no idea how open minded Mrs Noades was (or indeed how free spirited Mrs Zaha is- assuming there is one) but what the HELL? It's a luxury house, not a prison cell: who wants to watch their partner going for a crap at 3am??
I've stayed in a hotel like that in Amsterdam: there was no screen around the shower either. It was a business trip so I was on my own but I did think it was a strange bit of room design - not everyone who shares a room is in a couple.
Perhaps Mr T had visited that hotel and liked the idea ...