©Courtesy of Britbox BritBox announced “The Lady“ will premiere on March 18th and released the official trailer and key art. The four-part drama series captures the rise and fall of former royal aide Jane Andrews, and stars Mia McKenna-Bruce (“Seven Dials”, “How to Have Sex“) as Andrews, Natalie Dormer (“Game of Thrones“) as Sarah Ferguson, the Duchess of York and Ed Speleers (“You“, “Downton Abbey“) as…