Use environ tag

This is a follow up branch to #553 (New EnvUser). Get the environ UUID
from the state environ tag.
Better as a stand alone function that takes a *State param rather then being a method on State.

I'm in two minds about always using the environ id which is on State, but I can't think of a reason not to, and it keeps the code simple.  We can always change it later if we need to :-)