Replace old room thermostat

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I’m trying to replace my old acl (Drayton?) thermostat with potentially a Honeywell DY4R (unless anyone has a better/cheaper option?). My issue is that the current stat only has a live, neutral and earth input whereas it seems that I need a common live too? I attach a photograph of the current stat. Any help would be greatly appreciated, thank you
 

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That's a 2 wire thermostat, so you don't even have neutral, just live and switched live. Either a battery operated 2 wire thermostat or wire in the wiring center or from the boiler if combi and decommission existing or set to maximum
 

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