Spoiler alert -I have watched the whole series.
I thought it was good entertainment, with some engaging plot themes and interesting characters.
However in many ways it did not seem to be based in reality.
There was far to much schmaltz and sentimentality, especially in the central relationships of Ruth and her daughters.
There seemed to be a lot of inter-racial pairings - Oscar and Maya, Rose and James, Xander and Tyler, Goldie and Davey, the lesbians who were having a baby and possibly others I can't remember.
The mixed race pupil barrister complained that only 12,5% of barristers were black or ethnic minority yet this does closely reflect the percentage in the UK population.
Hannah, the central character did in the end let go of her husband who had told her he still loved her. She also had protestations of love from Christy who wanted her to go to New York. She refused as her family was in London.
I think when Xander said he was taking time out and handing over the practice to Hannah, it would have made sense for her to ask Christy to come back to London.
However I think it is probably a plus for a drama that leaves us thinking about how we might have changed the plot. So we'll done Split writers.