Jules, I've got a 1.0 TOG grobag (am in Perth too) and our bedroom gets to 15 degrees at night (according to the room thermometer). I dress DS in a singlet and a bonds wondersuit under the grobag. Then he has a sheet and one of those light soft furry blankets folded in half. He seems to be fine in this.
A lady working in a baby store once told me that a 0.5 tog G/bag was equiv to 1 cotton sheet; a 1.0 tog was equiv to 1 cotton sheet plus 1 cotton cellular blanket; and the 2.5 tog was equiv to 1 cotton sheet plus 2 cotton cellular blankets. Hope that helps. I am also in Perth and in winter dress my DD in a long sleeved Bonds wondersuit and put her in a 2.5 tog G/Bag.
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