Thanks Chlidonias but I've a bird-guide of Australian birds in which Z. lutea and Z. citrinella ( Yellow and Pale white-eye ) are also called Silvereyes...
The latest book - The Australian Bird Guide by Menkhorst, Rogers, Clarke, Davies, Marsack & Franklin - refers to it just as the Silvereye, and all the others are White-eyes. But it used to be called the Eastern Silvereye. Never heard it called Grey-breasted though; possibly an old name.