Hello all, hoping for some help. I have a Honeywell CM707 thermostat connected to a Logic Combi ESP1 35 boiler. This is in a new build house. I want to replace the thermostat with a Nest Thermostat e which I bought, but I'm struggling with the wiring. As per the image, my current thermostat has a brown wire connected to A (Live according to the sticker?) and a black wire connected to B (Neutral according to the sticker?). The Grey and Yellow/Green wires aren't connected to anything. https://ibb.co/VW91cGs I'm unclear what should be connected into what on the Nest Thermostat e (Y1, G, R, W1, C, *OB). Image below. https://ibb.co/d6dDtnr Any help would be appreciated!