Who is Mr. Swan, Miss Preston from A Leg to Stand On and what is their importance? A_Leg_to_Stand_On English & Literature "Mr. Swan

After the author is transferred to a larger hospital in London, where he is to have his surgery, he is placed in the care of surgeon Mr. Swan, whom the author perceives as austere and somewhat dismissive. Later, after his recovery, the author, who, it must be remembered, is a physician of some note himself, has a conversation with Swan who is somewhat more forthcoming, but still seems to perceive himself in a position of authority. Also at the hospital in London, the author is visited by Miss Preston, the businesslike but friendly physiotherapist who becomes more and more perplexed by his inability of the author's leg to perform as she assumes it should. Her reaction is the first indication to the author that something about his leg is quite out of the ordinary.