Viv Rook tightens her grip, and the Lyons fight back. But can one ordinary family hope to change the world?

Cast: Emma Thompson, Rory Kinnear, Ruth Madeley, Maxim Baldry, Jessica Hynes, T'Nia Miller, Anne Reid, Lydia West, Kieran O'Brien, Sharon Duncan-Brewster, Jade Alleyne, Ellie Haddington, Rachel Logan, Mary Nightingale, George Bukhari