When did the British television period drama which has Joanna Horton included in one of its episode began airing? 
Joanna Horton: Joanna Horton is an English actress, notable for her stage and television work, including an episode of "Robin Hood" (series 1 episode 4), "Father Brown", "Spooks" and "Foyle's War". Father Brown (2013 TV series): Father Brown is a British television period drama which began airing on BBC One on 14 January 2013.
14 January 2013