Preheat the oven to 450 degrees.
In a medium bowl whisk together the olive oil, mustard, garlic, and Worcestershire. Add in the breadcrumbs and mix until combined.
Place the fish on parchment paper lined baking sheet. Season with salt and pepper.
Top the fish with the deviled breadcrumbs. Bake until the crumbs are browned and the fish is opaque in the center, about 15 minutes.
In a large skillet cook the bacon until browned, about 8 minutes.
Add in the leeks and cook, stirring often, about 2 minutes.
Add the tomatoes and cook, stirring frequently, for 3 minutes.
Remove from stove top.
Place one fish fillet on each of 4 plates. Divide the bacon mixture between the 4 plates and serve.