Casting Doubt is an observational documentary set in Portsmouth during the lead up to the 2026 local elections. Against a backdrop of campaign posters, media speculation and growing political frustration, the film investigates the increasing invisibility of Reform UK, and asks what is truly driving support for the party within working class Britain. 

National coverage has framed Reform UK as one of the country’s fastest-growing political movements, presenting its rise as evidence of a major political shift. Through local observation, archival media, election-day footage and analysis of voting patterns across Portsmouth, Casting Doubt examines whether this visibility reflects genuine political transformation or a media-amplified narrative that overstates the party’s momentum. 

The documentary explores the social and economic conditions often associated with Reform’s support base, including political disillusionment, rising economic pressure, distrust in traditional parties and frustration within working-class and older communities. Particular attention is given to the local areas where Reform performed most strongly, considering what these voting patterns reveal about wider dissatisfaction with Britain’s political establishment. 

Throughout production, repeated attempts were made to speak directly with local candidates, campaigners and political supporters across multiple parties. Despite initial interest from several contributors, meaningful participation proved difficult to secure. This absence becomes part of the documentary’s wider reflection on the gap between political visibility and political accessibility in modern Britain. 

By documenting Portsmouth’s local election as it unfolds, Casting Doubt presents a grounded examination of political frustration, electoral reality, and the tension between public political narratives and the quieter truths revealed at the ballot box. In doing so, the film asks whether Reform UK’s rise represents lasting ideological change, or simply another expression of protest in a country still searching for political answers.