Purée corn, onion and celery in food processor or blender. Put in large saucepan to simmer. Add chicken stock and 3 cups of the milk; simmer gently. Melt butter in saucepan; add flour; cook over medium 3 minutes without browning. Heat remaining 1-cup milk and add to flour-butter mixture, whisking until smooth and thick. Add steak sauce, hot sauce and Worcestershire sauce. Strain corn mixture if a smooth texture desired. Whisk corn mixture and cream sauce together. Simmer gently and serve hot.