There are two flats at each end of the corridor running through the middle of Willoughby House. One is a Type 100 and the other is a Type 101. It's the same on each of the six standard floors, so there are 12 Type 100s in all. The Type 100 contains a living room and a bedroom. (It also seems to me to be identical in layout to the penthouse flat on the top floor at the north and south ends of Willoughby House, which is a Type 114.)
