(Reuters) - Struggling baby products retailer Mothercare Plc reported a 8.4% drop in half-year worldwide sales on Tuesday, hit by past troubles at its UK operations and tough macroeconomic conditions in the Middle East and China.The company, which operates 1,010 overseas franchise stores, is dealing with stiff competition from online retailers and rising costs, leading to the collapse of its UK operations last month."We believe that without the financial and management burden of running a UK..