The only Nocturne that I've ever seen that actually flushed properly was the one in the old Neath leisure centre in the changing rooms that dates from 1992 but unfortunately the building has been demolished. As much as I hate to leave a negative comments about a piece of retro sanitary ware, semi close coupled toilets were one of the silliest ideas that anyone could think of, mainly due to the reason of it not being designed to flush properly but as long as it works who cares sort of thing would have been the designers attitude.