Cecelia Wolstenholme won the 200 yd breaststroke at the 1930 British Empire Games, beating who? 
Cecelia Wolstenholme:  She won the 200 yd breaststroke at the 1930 British Empire Games and the 200 m breaststroke at the 1931 European Championships, beating Jenny Kastein. 1930 British Empire Games: The 1930 British Empire Games (French: "Jeux de l'Empire britannique de 1930") were the first of what later become known as the Commonwealth Games, and were held in Hamilton, in the province of Ontario in Canada from 16–23 August 1930.
Jenny Kastein