Optimum Releasing would be a suitable distributor for the independent British thriller film. As an independent UK film company, Optimum specializes in distributing similar low-budget, British independent films and thrillers. They have had success distributing films with small budgets that appeal to younger audiences. Their marketing strategies, like using social media, would be a cost-effective way to promote the film to its target teen-adult demographic. Optimum also has experience distributing similar thriller genres to the one in the film, so they understand how to market and release that type of film.