Ah no, I'm Cambridge.
I'm 18 months post. I suffered from stress and anxiety relating to the birth for some months, and it did definitely improve as I started to resolve some of the lasting physical problems (e.g. through the Fenton's procedure).
I must admit, though, I can't say the trauma is totally resolved, as I am lying awake at nights again at the moment due to a combination of two friends being about to have their babies, and my own current dilemma about whether to go ahead with another pregnancy. Like you, it would have to be a section, and it's hard to trust the team to perform major surgery after the list of errors last time.
Although it's not my area, friends of mine who work with people with PTSD tell me that birth trauma is (worryingly) common. You have my absolute sympathy, MumtoBen, because I know exactly what it is like to be left shaken to the core, and having to work so hard to get the right treatment for the physical injuries. I felt damaged, in every way, for such a long time. But these past few months have been really different. Let's hope the surgery helps you - mine really made a lot of difference to me.
Of course, you will have to do whatever you feel is right for you, with regard to legal action. For me, as I said below, abandoning the matter was essential for me to move on, especially since it was clear that legal action wouldn't achieve what we hoped. However, your situation sounds easier to quantify than mine - some of the issues are quite clear-cut - so you might feel it is worth pursuing and that this would give you a more complete sense of finishing the matter.
On the matter of stress relating to the birth, it is (of course) perfectly normal to experience reliving the episode, associated anxiety etc. for some time after the event, but if you find it doesn't sort itself out gradually over time, do ask your GP for a referral to a psychologist.
Crossing my fingers for you in your op!