UPDATE 1-Ex-Barclays banker accused by U.S. of illegal tips to plumber
(Adds further details on case) By Nate Raymond NEW YORK, May 31 (Reuters) - A former director of Barclays Plc was arrested on Tuesday on U.S. charges that he provided inside information about impending mergers that he learned about at the bank to a plumber, who use the tips to illegal
