UK's SIG warns on earnings, CEO to go, shares dive

(Reuters) - British building materials supplier SIG announced Chief Executive Stuart Mitchell would step down immediately and warned on full-year profit citing weak trading hurt by Britain's vote to leave the European Union, sending its shares down sharply.. The company named Non-Executive Director Mel Ewell, who was CEO of infrastructure services provider Amey Plc [FERAC.UL] until March, as its interim group CEO. It forecast underlying pretax profit of 75-80 million pounds for the year, below t