Okay, now you have said what stage you are it, it's a bit clearer.
In general, you can see how London timings are going at the moment if you Google "immigration NZ London branch processing times" (but be aware that this is only an estimated average).
Also, there is not any one way that people get to know about a CO. There have been forum members who never knew they had been assigned until *somebody* out of the blue wrote to them and said they needed more information about xyz, and asked them when sending it, 'Are you my CO, then?' Some get an email or letter from the CO, announcing themself, though.
When you get to the stage when the CO is working the case, they may well tell you
nothing at all until one day they say, 'I want to interview you next week.' Before that point, the system will be working as I said here.
http://www.enz.org/forum/showthread....158#post425158