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In the video, at the moment near the end when you turn off the heating, is the boiler still heating the hot water?
More questions:Do you have a room thermostat?Do you have a motorised zone valve, near the hot water cylinder?
My hunch is that you're focusing on the boiler when the problem is elsewhere.It's unclear how you ever controlled the heating if you didn't/don't have a room thermostat. Do you have a Nest Heatlink, and the thermostat? I'm not clear what the thing is that your calling a controller.There should be only one switched live from the Heatlink to the boiler, and the boiler knows not why it's being asked for heat. If you disable the hot water heating, and let the boiler time out and shutdown, and then turn up the Nest thermostat, does the boiler ignite? If not, then the wiring at the Heatlink is wrong, or there's a motorised valve fault.