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Kirsten and Jorn Rausing

Sales passed £6 billion at Tetra Laval, the packaging group, last year and it is expanding into China with a £20m investment. Jorn, 47, and his sister, Kirsten, 54, who live and work in Britain, are on the board of Tetra Laval, co-founded by their late father, Gad. Jorn also has a 7% stake in Ocado, the online retailer. Kirsten, the richest person from East Anglia in our list, owns two Suffolk stud farms. Forbes values the family stake in Tetra Laval at £5.65 billion, half of which we ascribe to Kirsten and Jorn.