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thank you very much. I appreciate the advice.. I spoke with nest service today and sent them the attached photo and said left cable was from fused spur and right dirty cable goes to boiler. thankfully they said it was correctly done. I'll speak to their boss tomorrow and he may advise a return...

I too have a promax sl and chose the simpler wireless nest thermostat option. it talks the the heatlink lovely. problem is I have 3 wires that go to the boiler. live. neutral and earth. i put live into 3 and neutral into 2 and earth into earth . nada. nest says running heat but it lies...