Sat at a desk in an office close to Westminster Cathedral, Juan Sebastián Chamorro appears every inch a distinguished politician. He is a well-groomed man of 53 who speaks perfect English with a Nicaraguan accent, even mastering slang. He has after all had a little time to brush up on his second language because since February 2023 he has been living in exile in the United States, flown out of his native country with more than 200 other political prisoners after spending about two years in jail.