By Marc Jones LONDON (Reuters) – Barbados Prime Minister Mia Mottley used a speech in London on Wednesday to call for a global conversation on reparations for countries that saw their people enslaved, sometimes for centuries, under colonial rule. “The conspiracy of silence has diminished the horror of what our people faced,” Mottley said in a lecture at the London School of Economics where she studied in the early 1980s. Barbados was one of Britain’s first slave colonies. English settlers first occupied the Caribbean island in 1627 and, under British control, it became a sugar plantation econo…