1. Heat oven to 350°F. Grease and flour two 8-1/2x4-1/2x2-1/2-inch baking pans.
2. Stir together flour, sugar, baking powder and salt in large bowl. Add milk, oil, rum, egg and banana; stir with spoon until well blended. Stir in nuts. Spread 1-1/4 cups batter in bottom of each prepared pan. Top each batter with 1/2 cup toffee bits. Gently spread about 1 cup remaining batter in each pan. Sprinkle remaining bits over batter.
3. Bake 30 to 35 minutes or until wooden pick inserted into center comes out clean. (Bread will have slight sink in center.) Remove from oven to wire rack. With knife, loosen bread from sides of pan. Cool 10 minutes; remove from pans. Cool completely. 2 loaves.