I enjoyed it a lot. The drip, drip of information about her DH’s affair seemed quite realistic, he was only admitting to the minimum. Affair AND coming onto Nina must surely be the end.
DH thinks hannah is a hypocrite as she shagged christie before the marriage and, before these revelations, has behaved inappropriately with him at work, all the personal conversations and so on. But I think, as a couple of PPs say, her cheating was many years ago and that the “statute of limitations’ (?) has passed!
The DC on the stairs and being snapped at was sad and brought back some bad memories for me. 
Unrealistic that every episode they cram so much into evenings - swanky outfit to change into kept at the office, work late, drink for work, home (and DC still up somehow), marital argument, out, back into central London!