Fackham Hall succeeds because it effectively skewers its target genre, and its top-tier actors know how to deliver a joke to its furthest possible endpoint.
Like most movie spoofs, this one relies on quantity over quality, meaning that if you don’t find one joke funny you can rest assured there’ll be another one just a few seconds later. The team of five writers pack so many visual and verbal gags into the proceedings that some of them inevitably land, compensating for the profusion of groaners.
Sending up costumey, upstairs-downstairs tropes, the movie seldom lets five seconds pass without a wisecrack, pratfall or sight gag, sometimes all three stacked on top of each other.
One element of this film that works well is that the actors understand the assignment, no winking at the audience, except for British comedian/presenter and co-writer of the screenplay, Jimmy Carr, playing a vicar who cannot help running the liturgy texts together to make them sound dirty.