The Royal Opera House in London has urged Keir Starmer to intervene in the case of Paata Burchuladze, a world-renowned bass singer who has been imprisoned in Georgia since October on a charge of leading a coup against the country’s authoritarian leader. The 71-year-old has performed at the Royal Opera House and the Metropolitan Opera House in New York and collaborated with the likes of Luciano Pavarotti, Plácido Domingo and José Carreras. He was arrested after joining a protest outside the presidential palace in the Georgian capital, Tbilisi. Last week he was given a seven-year jail sentence which Burchuladze suggested to the court was equivalent to a life sentence given his age. Burchuladze became a rallying figure at nightly demonstrations against the government’s perceived pivot away from the west last autumn.…