There can have been few foreigners who ‘Heiled Hitler’ with more enthusiasm than Unity Valkyrie Mitford. Ever since she first became infatuated with the Führer at the 1933 Nuremberg Rally, her arm would shoot out on every possible occasion. Even Sir Eric and Lady Phipps, all too familiar with distressed upper-class parents whose daughters had fallen in love with ‘dreadful SS types’, were taken aback by Unity’s brisk ‘Heil Hitler’ as she entered their Berlin drawing room.