Broccoli pasta bake

Name: Broccoli pasta bake
Ingredients: 1l milk; 2 garlic cloves, bashed; 2 bay leaves; 500g dried pasta; 350g broccoli, in small florets; 75g butter; 75g plain flour; a little freshly grated nutmeg; 1 tsp mustard powder; small bunch parsley, roughly chopped; 200g cheese, grated (cheddar, Parmesan, Gruyère, or a mixture)