Dame Penelope Wilton is beloved by millions for her role as Isobel Crawley in "Downton Abbey". Now, she is playing a very different kind of matriarch - Queen Elizabeth the Queen Mother - opposite Luke Evans in the new West End play, "Backstairs Billy." Ahead of opening night, Penelope stops by Single Malt History to talk about her latest role with Queen Mother biographer, and Single Malt host, Gareth Russell.