2 medium leeks, hard green parts and stems discarded, diced (about 2 cups)
2 medium carrots, peeled and diced (about 1 cup)
2 celery ribs, diced (about 1 cup)
1 large garlic clove, minced
1 Turkish bay leaf
1/2 stick unsalted butter
1/3 cup all-purpose flour
2 cups whole milk
1 3/4 cups chicken broth
1 (12-ounce) bottle English ale
1 tablespoon Worcestershire sauce
1 teaspoon dry mustard
1 teaspoon salt
1/4 teaspoon ground black pepper
4 cups extra-sharp cheddar, grated
4 bacon slices, cooked and crumbled
crusty bread, sliced