Lesson number one - DO NOT USE POWDERED MILK!
I am in the process of making Feta cheese, a nice easy one I thought. I had heard that powdered milk could be used but it has made the process four times as long I think, and it's still not cheese. However it is finally starting to separate into curds and whey and after a long talk with the man who supplied me with the cheese making kit (on the phone) I haven't given up all hope. This man phoned me after I emailed him asking what I may have done wrong. What a great follow up with sales.
So stay tuned, it might be tomorrow morning before we have cheese but I will take a photo whatever it looks like. And buy fresh milk for my next attempt!