Preheat oven to 350F Lightly butter and flour 2 loaf pans. (The batter will fit in one pan if you prefer a larger loaf.)
Mix the salt, baking powder, baking soda and cinnamon into the flour and set aside.
Add the sherry to the milk and set aside.
Soften the stick of butter for 1 minute on defrost in the microwave if it hasn't been sitting out to soften.