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That's exactly right, I leave the heating on the programmer (which is next to the boiler itself) permanently on. I will have a look at the voltage between the blue and the red but also suspect it isn't connected at either end. In which case I'm not sure what to connect it to at the boiler end...

OK that sounds promising... So would the below be something worth trying?

Thanks very much. I feared as much! There are only two other unused cores in the wall: Blue and Earth, I am pretty sure they go straight to the fused spur under the boiler (as i blew that 3A fuse with one of my botched wiring attempts!)

Hello! I need some help installing a Honeywell Lyric T6 (R4H91) in replacement of a 2-wire wall thermostat in my new home. I can't figure out how to get it to work with just the 2 wires. I've tried the below, which powers on the box but does not trigger the boiler to heat. I feel like I need...