Preheat the oven to 180°C.
For the muffin batter: Sift together the flour, granulated sugar and baking powder. Place the flour mixture in a mixing bowl. Use a pastry cutter to mix in the butter and shortening.
Mix the marmalade, orange juice and vanilla in a small bowl. Pour the marmalade mixture into the flour mixture. Pour the eggs into the bowl. Mix all ingredients together gently, using fewer than 10 large strokes.
For the topping: Mix the granulated sugar, brown sugar, butter, cinnamon, nutmeg and salt in a small bowl.
Fill muffin pans with batter. Sprinkle 1 heaping teaspoon of topping ingredients over each muffin. Sprinkle 1/2 teaspoon wheat germ over the top for extra crunch if desired.
Bake until done, 20 to 22 minutes. Remove the muffins from the pan and cool on a wire rack. Eat warm or at room temperature.