The boiler cuts out when the thermostat clicks and vice versa temperature low temperature high. There is no lag. The boiler stops heating but circulation continues. Just the gap in temperature reading is of an issue
---------- Post added at 12:56 ---------- Previous post was at 12:17 ----------
I just realised I don't have home broadband, I tether from the device that is with me on my travels so remote control isn't an option. I will still chase an upgrade.