Beat in flour alternately with milk. Add vanilla and beat. Spoon 2-3 tablespoons batter into greased and floured cake pans. Cook for about 1-2 minutes each in 405 degree oven until lightly done.
The traybake and layer cake make up to 40 servings, and the cupcakes and fairy cakes make up to 24 cakes. If you're baking for larger numbers, simply re-run the calculator for a second batch.