The North Hampstead Operatic Society are putting on a production of Gilbert and Sullivan's The Mikado, with Hugo acting as director and Jacqui and Susan lined up for the roles of Yum-Yum and Pitti-Sing. Dudley attends the auditions at Stanley Barlow's bookshop in the hope of securing the lead, but has to make do with painting the scenery and playing the part of the third coolie in the chorus. Honourable secretary Stanley takes the role of the Mikado for himself. Meanwhile, Duncan is producing Oklahoma! for a rival society; his leading lady walks out on him, so he offers the role to Susan, who eagerly accepts. He heads off for London Airport to meet a Mr. San Pueblo from Tijuana, Mexico. Jacqui is disgusted when she learns her sister is planning to drop out of The Mikado, chastising Susan for her disloyalty. Dudley telephones Duncan's office to complain about his underhand behaviour, and Wilma takes the number of the church hall so that she can arrange for Duncan to ring him back when h