Seona, thanks for that link, i've bookmarked it to have a good look at the site later.
So what i can gather, creme fraiche and sour cream are both made from cream and yogurt is made from milk.
Thought this was interesting though....
"In general, crème fraîche and sour cream can be used interchangeably in most recipes, but crème fraîche has two advantages over sour cream: it can be whipped like whipping cream, and it will not curdle if boiled. "
The reason i asked is that i have been trying to get a 0% greek yogurt and resorted to making my own.
I started with a semi-skimmed milk and made regular yogurt. Success! Then i strained some of it and made a really thick creamy greek yogurt! Fantastic. So easy, i'd recommend it to any one.
I'm going to try it again using skimmed milk and see how it goes. Don't reckon i'll get to 0% but he ho.
It just started me thinking, what the difference is between all.
Thanks for your replies.