The director of the first filming block, Jamie Childs is the only director who was officially announced. Childs' involvement was first discovered by @Ruther2.
Childs was then officially announced in Doctor Who Magazine. Childs also directed Jodie Whittaker's reveal which premiered on July 16. Childs directed Episodes 1 and 7.The director of the opening block is @jamierosschilds pic.twitter.com/YDUXqHZkFo— Ruther (@Ruther2) October 26, 2017
From Doctor Who Magazine 519 Gallifrey Guardian:More #RutherExclusive #DoctorWho s11 info: the opening block is episodes 1 & 7 @cultboxtv pic.twitter.com/BZXVJNsoTw— Ruther (@Ruther2) October 27, 2017
"…Jamie Childs is the first director to be working on the 2018 series."
Then gradually, the other directors were discovered. Mark Tonderai directed Block 2, Episodes, 2 and 3, which was filmed in part in South Africa."
It looks as though the director of block 2 (?currently filming in South Africa?) is Mark Tonderai https://t.co/xhGhvUecwW— Ruther (@Ruther2) January 6, 2018
Sallie Aprahamian directed Block 3, Episodes 4 and 6.
— Ruther (@Ruther2) December 23, 2017
Jennifer Perrott is currently directing Block 4, most likely Episodes 5 and 8.
#Rutherexclusive #DoctorWho news - Dunno if it's block 4 or 5 but it's good to know we have a new female director on Doctor Who: Jennifer Perrott https://t.co/2hVYcoQZOM— Ruther (@Ruther2) May 8, 2018
Which would leave what is likely the the finale block to Jamie Childs, who will return to direct the final block, Block 5, likely Episodes 9 and 10.
It's block 4. Jamie Childs is back for block 5 pic.twitter.com/7PRDyQOuNi— Ruther (@Ruther2) May 9, 2018