Have I missed somethinhg here?
My three way time controller has buttons that switch off any of its
three zones?

The proposal is for programmable room thermostats and no overall programmer,
just a switch to turn off the entire heating system (except HWC).

Obviously, a 3 channel programmer with non-programmable stats is a different
system, also with an easy way to totally turn off the heating. However, it
doesn't allow a local button for override/boost and doesn't allow different
temperatures at different times of day.

Christian.