Downing Street is under fire over revived plans to build a vast Chinese "super embassy" in London — a proposal previously blocked by the former Conservative government.Planning documents for the proposed site, located at the historic Royal Mint buildings near the Tower of London, reveal “two suites of anonymous unlabelled basement rooms and a tunnel”, with their intended purpose redacted “for security reasons”.The Conservatives have accused the government of "appeasement" towards Beijing, warning the so-called "dungeons" could be used for espionage or to intimidate dissidents, according to the Mail on Sunday.