I had a search through the recipe community to see if corrected recipes have been uploaded there.
Found this one:
http://www.recipecommunity.com.au/recipes/trixies-light-air-sponge-cake/42169I am not sure if this has been changed from book to RC version, but I have heard that if you do not need a GF cake, the flour version is preferred.
I tasted is at a demonstration and it is a delicious cake. At the Hobart class, it was served with strawberries and Grand Marnier filling, but, alas, I wasn't there to partake.