The St Stephen's Day wren "hunt" still occurs all over Ireland, though the real bird has been replaced with a fake one that's paraded through the streets.
The biggest challenges were creating an authentic Irish winter in the Midlands in May. And finding a prison within budget. But Rutland's tourism officer came to the rescue, and ended up serving as the film's locations manager.
The film's producer, Sorcha Bacon, also appears as Guard no.1.