Watch 123Movies. Cul-de-sac is a middle-aged misadventure film from BAFTA-winner Colin O'Toole set in suburban Manchester during the mid-1980s. A couple finds that their lives are reaching a dead end. Stuck, they take a risk to save their relationship, but could this be a step too far? Cul-de-sac is a film about long-term relationships, communication, childhood memories, planning permission, pampas grass, and the refuge people place in distracting obsessions.