series created by Heidi Thomas ; produced by Ann Tricklebank ; written by Heidi Thomas, Nicola Wilson, Jonathan Harvey, Lena Rae, Lucy Catherine, Lisa Holdsworth ; directed by Syd Macartney, Ann Tricklebank, Noreen Kershaw, Thomas Hescott, David O'Neill, Sarah Esdaile, James Larkin, David Tucker ; a Neal Street production for BBC and PBS
a BBC Studios and BBC Wales production in partnership with the Open University ; co-produced with Lookout Point and Masterpiece ; produced by Karen Lewis ; written and directed by Sally Wainwright
produced and directed by Paul Thompson ; a BBC Studios Natural History Unit production for PBS ; a BBC Studios production for PBS, BBC and Tencent Penguin Pictures ; a BBC partnership with Open University