British-born Weston already owns the Dublin store group, Brown Thomas, and the Holt Renfrew department store chain in Canada. The bid is being made by an arm of his Wittington Canada company, one of the largest food processing companies in North America. With an estimated fortune of £3.9bn Weston, 62, ranks as the 43rd wealthiest person in the world. His elder brother Garry, who died last year, invented the Wagon Wheel biscuit and expanded the British end of the family empire, including Kingsmill bread, Silver Spoon sugar, Associated British Foods and Fortnum & Mason.