Act 2 opens on another Sunday afternoon, with Helena and Alison making lunch. In a two-handed scene, Alison gives a clue as to why she decided to take Jimmy on — her own minor rebellion against her upbringing plus her admiration of Jimmy's campaigns against the dereliction of English post-war, post-atom-bomb life. She describes Jimmy to Helena as a "knight in shining armour". Helena says, firmly, "You've got to fight him".
Jimmy enters, and the tirade continues. If his Act 1 material could be played as a joke, there's no doubt about the intentional viciousness of his attacks on Helena. When the women put on hats and declare that they're going to church, Jimmy's sense of betrayal peaks. When he leaves to take an urgent phone call, Helena announces that she's forced the issue. She's sent a telegram to Alison's parents asking them to come and "rescue" her. Alison is stunned but agrees that she will go.
After a scene break, we see Alison's father, Colonel Redfern, who has come to collect her to take her back to her family home. The playwright allows the Colonel to come across as quite a sympathetic character, albeit totally out of touch with the modern world (as he himself admits). "You're hurt because everything's changed", Alison tells him, "and Jimmy's hurt because everything's stayed the same".
Helena arrives to say goodbye, intending to leave very soon herself. Alison is surprised that Helena is staying on for another day, but she leaves, giving Cliff a note for Jimmy. Cliff in turn hands it to Helena and leaves, saying "I hope he stuffs it up your nostrils". Almost immediately, Jimmy bursts in. His contempt at finding a "goodbye" note makes him turn on Helena again, warning her to keep out of his way until she leaves. Helena tells him that Alison is expecting a baby, and Jimmy admits grudgingly that he's taken aback. However, his tirade continues. They first come to physical blows, and then as the Act 2 curtain falls, Jimmy and Helena are kissing passionately and falling on the bed.