Step 1: 1. Cook pasta to packet instructions, drain and then put in the bottom of a oven proof dish
Step 2: 2. Tear/ grate the bread until they are crumbs
Step 3: 3. Melt some butter in the pan and then place the breadcrumbs in with it. Coat thoroughly and remove from heat.
Step 4: 4. Melt some more butter in a pan and then add flour until it forms a dough, cook for about 2 minutes (it is best to do this at a low heat)
Step 5: 5. Add milk in steady and slow stages until the sauce is at the texture you want (you can add mustard at this point if you wish).
Step 6: 6. Stir in the cheese until it has melted and remove pan from the heat.
Step 7: 7. Pour sauce over the pasta and then scatter the breadcrumbs on top
Step 8: 8. Bake in the oven until the breadcrumbs are crispy (20- 30 minutes is normally about right)