Chanel No. 5 is probably the world\u2019s most famous perfume, but is one dogged in scandal. Between the 1920s and 40s the perfume was at the centre of a dispute between designer Coco Chanel and her Jewish business partners the Wertheimer brothers. Chanel and her Nazi lover worked together to gain control of the business. The No. 5 War is on BBC Four at 21.00.