Mrs. Smith was the mother of Mike Smith. Living in the Shoreditch area she Ran a boarding house where the Seventh Doctor and Ace stayed during the Shoreditch Incident. Her son Mike was killed when he confronted Ace back in the boarding house, he answered a knock at the door and killed by The Girl. Mrs. Smith Attended her sons funeral with Group Captain Gilmore.
Ace suspected Mrs. Smith having bigoted views after Ace found a sign hanging in her living room window reading "NO COLOUREDS"