Preheat the oven to 350°F. 

Cook the noodles according to package directions, drain and place in a large bowl. 

While the noodles are cooking, heat the butter in a skillet over medium heat. When the butter has melted, add the onion and celery and cook for 3-4 minutes or until the vegetables have softened slightly. Add the garlic and cook briefly. Stir in the flour and cook, stirring constantly, for 2 minutes. Gradually add the milk and cook, stirring constantly for 4-5 minutes or until the sauce has thickened. 

Remove the pan from the heat and stir in some salt and pepper to taste. Pour the sauce over the noodles. Add the tuna and peas. Stir gently to distribute the ingredients evenly. 

Place the mixture in a 1 ½ quart casserole dish. Sprinkle the surface with bread crumbs, Swiss cheese and Parmesan cheese. Bake for about 20 minutes or until lightly crispy on top.