Preheat oven to 375°F.
Heat a skillet over medium-high heat with oil; add bacon and render 2-3 minutes. Add apples, celery, onion, bay and salt, and cook to tender, 7-8 minutes. Add Calvados or brandy and cool completely; remove the bay leaf.
In a large bowl, season beef with salt and pepper. Add the cooled bacon and vegetables, the egg, breadcrumbs, sage, thyme, parsley and allspice to the bowl mix well.
Line a baking sheet with parchment paper and form a loaf about 4 inches across and 4 inches high.
In small pot, warm stock and melt jam into it. Add Worcestershire and passata or ketchup and let thicken 3-5 minutes at a low bubble.
Slather meatloaf with 1/3 of the sauce and bake 15 minutes uncovered. Remove from oven, tent with foil and bake another 35-45 minutes, or until internal temperature of 145°F.
Serve with mashed potatoes (I like white sharp cheddar and nutmeg in mine) and a roasted or sautéed green vegetable, like green beans, with remaining secret sauce on the side.