Chelsea buns are quite similar to sticky buns, cinnamon rolls or cinnamon buns  (in the U.S and Sweden), with the addition of sultanas in it's cinnamony center. The consistency of the South African chelsea bun also differs from cinnamon buns. It is not pastry like but rather more like soft bread rolls and less moist. In my childhood they were often sold at Tearooms along with pink Durban Snowballs, cream buns and long fresh  cream doughnuts.