1. Preheat the oven to 180°C. Grease and line a 20cm x 12.5cm loaf tin.
2. Sift flour, bicarb and salt into a large mixing bowl.
3. In a separate bowl cream the butter, sugar and Sweet’N Low until light and fluffy.
4. Add the eggs, bananas, butter milk, and vanilla, and mix well. Gently fold in the flour.
5. Pour the cake mixture into the tin and bake for approximately 1 hour or until the cake is well risen and golden brown.
6. Cool in the tin before turning out onto a wire rack to cool completely.