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“I wanted to write something that grew out of the landscape,” said David Rudkin about his Play for Today, Penda’s Fen. When filmmaker Alan Clarke (Scum) set about adapting Rudkin’s script to the screen, he confessed he wasn’t quite sure what it was about, and decades after its initial broadcast, it remains mysterious. An epic tale of myth and identity, in which a sanctimonious, closeted vicar’s son has a spiritual and sexual awakening after being visited by a series of angels, gargoyles, and the ghosts of Edward Elgar and a long-dead pagan king, Penda’s Fen is the most magical of all British folk horror films, what scholar Sukhdev Sandhu called “a lasting vision of heresy and pastoral horror.”