Here is the recipe that I have used. If you prefer the cake with out chocolate, don't add the cocoa.
11/2 cups flour
1 cup sugar
4 Tbs cocoa
1ts bicarbonate soda
½ ts salt
1 cup water
½ cup vegetable oil
2 Tbs white vinegar
2 ts vanilla extract.
Combine dry ingredients, combine wet ingredients and stir into the dry ingredient mixture. Pour into 20 cm round tin and bake at 180 degrees Celsius for 23-35 mins.