ggg - am about to make sponge cake myself - I use same recipe but in bigger quantities - and use food processor - makes it VERY quickly! Bung in 8oz sugar and 8oz butter, blend till creamy (2 mins), gradually add 4 eggs (1 egg, 1 tsp SR flour), blend in, till all eggs added ,then add remainder of flour (total flour is 8oz), stirring in gently with metal spoon, put in tins, 180 degrees C, about 12-15 mins.