London 1939: Bradley has much to gain from another war and prevents his son Austin from returning to the PM with a peace document from Germany. Lady Patience refuses to allow the threat of war to interfere with the Annual Ball at Lancaster House.

When Bradley hears of the government's plans to scrap production of his latest invention, the midget submarine, he uses his contacts in the civil service to get an announcement in the House of Commons that the contract has been extended and that his son Austin has volunteered to test the new naval devices.

Bradley shares opinions on the war's conduct with Winston Churchill. Meanwhile, Jack persuades Lady Patience to finance his scheme for the production of the self-sealing saddle valve. Matthew is prevented from marrying Charlotte.

Bradley purchases a country estate. Inspector McDuff has new evidence implicating Matthew. Jack reclaims Charlotte's child and offers to marry her. Matthew is in France and is accused of selling the artificial legs he's in charge of. Morris is discovered relaxing on the beach at Dunkirk.

Bradley prepares the grounds at his new country estate for a cricket match. Morris and Matthew meet in France and attempt to escape the Germans by stealing one of their planes. They make it to England and as they fly over the cricket pitch, they send a message attached to Morris's golliwog.