In a large bowl, beat the butter, sugar, lemon juice and eggs. Combine the flour, baking powder and salt; stir into egg mixture alternately with milk, beating well after each addition. Fold in the blueberries, nuts and lemon zest.
Transfer to a greased 8x4-in. loaf pan. Bake at 350° for 60-70 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack.
Combine glaze ingredients; drizzle over warm bread. Cool completely.