Gillian is asked on a date by personable customer Gary but he has an alternative motive. He believes that Alan is his father, as a result of a brief fling with Gary's m other Mary, whilst he was still married. Advised by Caroline Gillian tells Alan, who admits it and prepares to see Gary though he is also concerned for his friend Harry, who has to sell his house to settle a court claim. Caroline meanwhile is planning to marry the pregnant Kate, leading to embarrassment for son Lawrence from homophobic fellow pupils. She tells Kate that she feels obliged to tell Celia Alan's secret whilst Alan himself meets Gary in town.

　　《老爸上战场》的主角是一群居住在英国小镇上的老爷子，他们的身份本是银行职员、小店老板。随着二战愈演愈烈，满怀报国热情的爷爷们没资格参加正规军，却自发组成志愿军团保家卫国，与德国间谍斗智斗勇。这支非正规军引起了媒体的主意，泽塔·琼斯饰演的女记者也来到小镇报道他们的故事。

　　本片根据Ronald Harwood的同名戏剧改编，Anthony Hopkins扮演一名年迈多病的演员，Ian McKellen扮演对他忠心耿耿的幕后助手兼化妆师Norman。故事发生在第二次世界大战期间。据称该剧的原型人物就是Ronald Harwood本人——他曾是著名英国演员Donald Wolfit爵士的化妆师。