Preheat oven to 350 F or 180 C

2.Cook the macaroni according to package instructions then drain in cold water. Chop bacon and fry in a pan. (keep the bacon fat). Set macaroni and bacon aside. Make the breadcrumbs by grating or using a food processor to turn the frozen slice of bread in to crumbs. (It is much easier to do when it is frozen!)

Make the sauce by first melting the butter in a pan, then add the flour.

Use a wooden spoon and stir very well, until it is all combined. Keep stirring this mix for 1 minute on a medium heat. You need to cook the starch. Then remove from the heat.

Start by adding 3 Tablespoons of the milk. Combine using the spoon, stirring until it is combined. Then add 1/3 of the milk, again, stir until it is combined.

Keep stirring the mixture, it will take a couple of minutes, and you will get lumps. Don’t worry at this stage! The lumps will go, so long as you stir. Use your wooden spoon to make sure none of the flour is stuck in the sides of the pan. At this stage, return the pan to a medium heat, and add the remaining milk.

If you have a hand whisk, switch to using it now, and add the mustard, salt and pepper and herbs. Continue to stir until the sauce becomes thick and holds to the whisk. It should be a ‘coating’ consistency. Be patient, it will seem like nothing is happening for a while, then suddenly, hey presto! The sauce immediately thickens. Keep stirring!

When it has thickened, add the grated cheese and stir in well. Then add the macaroni and bacon. Combine well then gently add the crab, taking care not to break it up too much. It's nice to have lumps of crabmeat people can bite into!

Transfer the mix to a suitable size baking dish, making sure it is deep enough. Sprinkle the breadcrumbs all over the top then place the dish in a baking pan incase of over spill and bake for about 20 - 30 inutes or until golden brown.

10. Remove from the oven and let it rest for at least 30 minutes. Then serve!