The French billionaire families that own two of the biggest luxury retail empires in the world have pledged a combined €300 million (£260 million) to help repair Paris’ iconic Notre-Dame Cathedral. The billionaire owners of the LVMH and Kering luxury goods groups have pledged a combined €300 million (£260 million) towards repairs to the fire-ravaged Notre Dame Cathedral. The Pinault family, owners of Gucci, Balenciaga, Alexander McQueen and Yves Saint Laurent parent company Kering, will...