LONDON, Dec 6 (Reuters) – TUI, Europe’s biggest travel operator, said on Wednesday it was considering leaving the London Stock Market and upgrading its listing in Frankfurt, where trading in its shares has increased significantly and more of its investors are based. The move, which could be put to shareholders in February, would be a blow to London after Britain’s biggest chip company ARM floated in New York this year and building supplies firm CRH and plumbing equipment company Ferguson shifted their main listings to the United States. Hanover-based TUI’s dual listing stems from the merger of its holiday business with Britain’s First Choice Holidays in 2007 to create London-listed TUI Travel. Seven years later, the companies fully merged. It…
