UK-EU Brexit talks back on as clock ticks to trade deadline

European Union negotiators headed to London on Thursday to resume Brexit trade talks after Britain called off a boycott, with both sides vowing to work round the clock to seal a deal in the time left. Led by chief negotiator Michel Barnier, the EU team was en route from Brussels after a dramatic breakthrough on Wednesday gave Britain an outlet to end days of brinkmanship and redouble efforts to prevent economic chaos at the end of the year. In a…