Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente. Drain and reserve.

Preheat oven to 175 degrees C (350 degrees F).

In a large sauce pan, melt 4 tablespoons butter or margarine over medium heat. Add flour and some ground black pepper to taste; stirring until paste-like consistency.

Add milk to mixture and stir continually until mixture starts to thicken; slowly stir in cheese 1 cup at a time until all cheese is melted.

Add double cream.

Pour cheese mixture over macaroni. Mix well and pour into a lightly greased 9x13 inch baking dish.

Place bread pieces on top of macaroni mixture and season with salt and pepper to taste. Melt 4 tablespoons butter or margarine and pour over bread.

Bake in preheated oven for 25 to 30 minutes or until bubbly and golden brown. Serve.