I've built up a little fantasy in my head that DCS Carmichael is the same person as Julia from Motherland.
At work she's the po-faced, smug Patricia hell bent on destroying AC12, has a personal agenda against Ted Hastings and a killer repertoire of sarky put downs.
However, her ice calm exterior at work is just a facade. At home, she's constantly nagging after her kids, doing a mad dash to school late every day and drowning in laundry.
The fact that Anna Maxwell Martin plays both roles makes this transition a seamless one (for me, at least).