Frasers Group has warned Unite the Union against taking “reckless and irresponsible” industrial action after the trade body threatened strikes across the retailer’s warehouses in a dispute over pay. In a strongly worded letter to Unite general secretary Sharon Graham, Sir Jonathan Thompson, chairman of Frasers Group, said he was “extremely saddened” by what he described as the union’s “inflammatory and confrontational” tactics. “I therefore hope that you will wish to avoid rash action that...