What year did the acress who portrayed Lady Prudence Shackleton on Downton Abbey join the board of the Mind the Gap Theatre?
Mind the Gap Theatre:  In 2013 Dame Harriet Walter joined the board. Harriet Walter:  On television she starred opposite John Lithgow as Clementine Churchill in "The Crown" (2016), Natalie Chandler in the ITV drama series "" (2009–14), and as Lady Prudence Shackleton in four episodes of "Downton Abbey" (2013–15).
2013