Ok that worked....
It seems to be working so far.
I should work through the current models and work how.
The hallway is normally set via Indigo and a external thermometer to not go below 18c.
During the night at about 4am I am seeing the 17c hallway thermostat kick in and start the heating.
Indigo will shut it down if the three rooms it monitors during the night are at setpoint, equally, if the thermostat in the hallway sends a shutdown to boiler while any of the three monitored rooms is below setpoint then Indigo starts back up.
The hallway thermostat is happy as long as it keeps above 17c.
The hallway, because the rooms around it runs between 19-20c during waking hours, just through the unrestricted radiator in the hallway.
But so far it does pretty well, I capture 72 hours of temp for all rooms in the house and graph them so I can see trends.
Really enjoying the multigraphs of the spirit radiators
way too geeky?
But gives a real insight as to their behaviour.