A combination of Home Assistant, EmonCMS, and being bored on a Sunday afternoon ended with this new display.
As is your ability to measure gas-usage from a CT on the gas-boiler: that deserves wider publicity here! Maybe a link in the Learning Section or etc?
What TRVs are you using to know the position?
These are Honeywell HR92 TRVs. The position is being picked up by a HomeAssistant instance then passed back to EmonCMS via MQTT.