European shares dip as investors seek signs of trade deal progress

(Reuters) - European shares were slightly lower on Tuesday after a strong start to the week, as investors sought concrete signs of progress in U.S.-China trade talks, while London's Compass Group tumbled after signalling softness in its European business.Compass Group Plc fell as much as 7.8% after the company said deteriorating consumer confidence in Europe had hurt margins at its unit that provides catering services to companies.The stock, on track for its worst day in more than five years,..