Rosie Leslie and Laura Haddock (spoilers)

I haven't see Season 5 yet as it's not up on Netflix. But checking the cast list on IMDB I'm surprised they didn't bring back Rosie Leslie as DS Emma Lane and Laura Haddock as Megan Cantor. Unless both were busy with other work, Leslie has the U.S show A Good Fight besides that she's not overly busy with work and Haddock wasn't exactly over run with work either.

With Leslie I thought they were building her up as Luther's new partner after the death of D.S Ripley in season 3. But she didn't return. Also Megan Cantor by the end it felt they were building her up as the Villain going forward for Luther by the end of season 4.

I liked the look of Cantor as a villain and I thought plenty of millage in DS Lane as Luther's partner.