Netflix’s “Enola Holmes 3” has started production in the U.K., with Millie Bobby Brown, Louis Partridge, Henry Cavill, Helena Boham-Carter, Himesh Patel and Sharon Duncan-Brewster returning for more Victorian-era detective hi-jinx. This time, Philip Barantini, who made a major splash recently with “Adolescence,” directs from a script by Jack Thorne. More to come.