A biscuit...thats what we call cookies....i want a nice light sponge..

No, cookies is what we call "koekjes"
Biscuit is a french word (it sounds frech , not english when we say it) It sounds like this: "bis k we"

Biscuit cake is a nice soft non-butter cake.
It is good for decorating but for cutting shapes it can be too soft.

If you want to make a 'biscuit' without having to buy the mix from the webshop, try the recipe thats on the website:

For 1 large egg, take 30 grams of sugar and 30 grams of plain flour (or use 25 grams of flour and 5 grams of cornflour).
You need 5 eggs for a round 24 cm pan. (therefore 150 gr sugar and flour)

Make sure the eggs are not cold (put them in a bowl of hot water for a few minutes before you start).
Mix the eggs with the sugar and a pinch of salt until it's alomost white and thick, like cream (mix at least 10 minutes) fold in the flour and pour in the prepared pan (baking sheet/greased) and bake for about 40 minutes at 180 degrees C.