After several very wet years (which presumably gave rise to ideas for part of the plot) when they came to film this episode it was in the middle of an exceptionally hot and dry spring. As a result, characters stand debating when the river will burst its banks despite it being practically empty. When filming wet scenes, the location had to be repeatedly sprayed with water as the hot sun kept drying it out.
Patricia Brake plays Stella Spencer in this episode. She previously played the role of Anne Quarritch in episode 3.4, Beyond the Grave (2000).
Neil Dudgeon previously appeared with Paul Copley in Messiah The Promise.