Andrea Yates's universe

Andrea Yates' World was an alternate timeline created by the Trickster when he offered Andrea Yates the chance to live, swapping places with Sarah Jane Smith. The timelines diverged in 13th July 1964, when Sarah replaced Andrea, fell off a pier and drowned. In the altered timeline, Andrea lived on 13 Bannerman Road, Ealing and had a successful career as a painter. Luke Smith did not exist in this world though Maria Jackson and her father Alan still lived on 36 Bannerman Road.

It was destroyed when Andrea took back her acceptance of the Trickster's offer of Sarah Jane's death instead of her's. The universe was rewritten and Andrea was killed. The only people who could remember the timeline were Sarah Jane, Maria, Clyde, Alan and the Trickster. (SJA: Whatever Happened to Sarah Jane?)