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The Czech officers organise a dance to keep morale up as the Battle of Britain intensifies. Joyce has some advice for Sarah which is not well-received, while Pat realises that somebody knows about her relationship with Marek. Allison's secret work for the police leaves her forced to decide where her loyalties lie. Steph fears that Stan is becoming a bad influence on his son, and Frances finds out that Peter's affair was more complicated than she thought.