It's only been rolled out to a few countries at the moment. It hasn't yet hit the UK.
If you look at the following page and scroll down you'll see a list of the countries and carriers it has been rolled out to.
Galaxy Note II receives Android 4.1.2 Jelly Bean Update, Lots of new features | SamMobile
no update here either... in fact, no mention of CANADA anywhere on the web!!! and moreover, Canada is not even on the list for the PENDING countries... WTF!!??
Well of course Canada is last! Isn't Canada considered a third world country with limited phone coverage?
My phone is sim free