Faintheart

Faintheart is a 2008 British comedy film, directed by Vito Rocco and starring Eddie Marsan, Ewen Bremner and Jessica Hynes. It concerns a lead character involved in the historical reenactment of ancient battles and is the first film to be created using active input from an online site.citation needed

Romantic comedy concerning Richard and his efforts to win back his wife, whilst taking part in weekend reenactments of Viking battles. At the same time he is bullied at work and his son is bullied at school because of his fathers hobby.

Source: Wikipedia