Sue is trying to organize a conference so it falls to Pete to let Karen in after school but he has to go to buy a central heating pump so rings Jake to come home. Jake has lost his Oyster card and has no cash so this requires a call to Ben, only for Pete to find himself speaking to a Chinese tourist who has found Ben's lost phone. Karen is delayed as the headmistress keeps her back to upbraid her for rubbishing the school rules. Nonetheless she still manages to get in ahead of Pete whilst Ben ends up asking the Chinaman and his wife round for tea.