How are the rooms of Hetton symbolic in the novel, A Handful of Dust?

The rooms at Hetton even become characters. Tony sleeps in the Morgan le Fay room, known as a magician and half sister of King Arthur and said to have been unhappily married. She is an adversary to Arthur until Morgan uncovers the famous affair between Guinevere, Arthur's wife and a knight, Lancelot. The event lead to reconciliation between the siblings. Guinevere is the name of Brenda's room and Beaver resides in the Sir Galahad room during his stay at Hetton. Sir Galahad is Sir Lancelot's son, conceived when another woman dupes him into believing she is Guinevere. The rooms are used for foreshadowing the plot, the reader now anticipating the connections.