 FAIR: In the episode, "You Must Remember This" the Type For You  sign on the building door lists the offices as being on the first  floor. When Sandy and Judith stand at the office window and watch a  disgruntled secretary try to break the aforementioned sign, they  stand at a second story window looking down from Judith and Jeans  office. Since the series is set in the UK, the first floor is indeed  the second story (above the ground floor).