Serves 6 550 kcal

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- 300g macaroni
- 600ml whole milk
- 150ml double cream
- 200g mature cheddar cheese, grated
- 100g gruyere cheese, grated
- 50g parmesan cheese, grated
- 1 teaspoon English mustard
- 50g panko breadcrumbs
- 50g unsalted butter
- 50g plain flour
- 2 tablespoons fresh parsley, chopped