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Cook bacon in a 10- to 12-inch heavy skillet over moderate heat, stirring occasionally, until slightly crisp, 6 to 8 minutes. Transfer bacon with a slotted spoon to a bowl. Add 1 tablespoon oil to fat in skillet, then cook fennel with salt and pepper over moderate heat, turning occasionally, until lightly browned, 6 to 8 minutes.
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Add broth, cream, tomatoes, and garlic to fennel and cook, partially covered, over moderately low heat, stirring occasionally, until fennel is tender and cream is slightly thickened, about 20 minutes.
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While fennel cooks, heat remaining 2 tablespoons oil in a 12-inch nonstick skillet over moderately high heat until hot but not smoking. Season fillets with salt and pepper, then sauté 4 minutes. Turn over and sauté until just cooked through, about 3 minutes more.
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Stir mustard and bacon into fennel ragout and season with salt and pepper. Serve cod over fennel ragout.