Andy Whittaker secures access to police documents which detail Mark Stone’s involvement in a plot to stop and board a coal train heading for Drax power station in Yorkshire.

Andy hears of other moments of protest, including climbing a lighting tower to hang a protest banner and we dive deeper into Mark's activities in Denmark, Ireland, Germany, Iceland, the USA, Spain and France.

Also, we hear more about Mark's friendships and relationships.

Mark Stone is played by John Pakey.