“Fackham Hall” — say it poshly and fast, and don’t blame me — occupies a hitherto unpopulated cinematic niche: a “Downton Abbey”-esque tale told in the style of “The Naked Gun,” with a few dashes of “Gosford Park,” “Four Weddings and a Funeral” and “Mary Poppins” mixed in. It’s 1931, and young Lady Rose Davenport (Thomasin McKenzie), daughter of a titled family living in a vast manor house, falls for pickpocket-turned-hallboy Eric (Ben Radcliffe) — who soon finds himself framed for murder.

Various additional plot complications ensue, including a jilting at the altar, a crisis involving an entail (Rose’s brothers John, Paul, George and Ringo have all previously died mysterious deaths) and rather a lot of R-rated jokes that I can’t describe here. (The Dowager Countess, rest her soul, would

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