Preheat oven to 400°. Cook bacon in a Dutch oven over medium heat 8 to 10 minutes or until crisp. Drain on paper towels, reserving 3 Tbsp. drippings.
Add onion to hot drippings, and sauté 3 minutes. Add carrots and celery; sauté 4 to 5 minutes or until carrots are crisp-tender.
Remove from heat, and add wine. Return to heat; cook 2 minutes.
Sprinkle with flour; cook, stirring constantly, 3 minutes. Whisk in broth; bring to a boil. Boil, whisking constantly, 2 to 3 minutes or until thickened. Stir in evaporated milk and next 5 ingredients.
Remove from heat, and stir in chicken, peas, and bacon. Spoon mixture into a lightly greased 11- x 7-inch baking dish.
Cut pastry into squares and place over hot filling, in a patchwork design.
Whisk together egg and 1 Tbsp. water. Brush over pastry and sprinkle pastry with sea salt.
Bake at 400° on lower oven rack 35 to 40 minutes or until browned and bubbly. Let stand 15 minutes before serving.