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Got it, thank you very much for your help!

If you think the above is a workable solution then I'm just left with figuring out which cables goes where in the thermostat.

Thats seems correct - 5 core cable to the boiler (matches with the boiler pcb) and the right one goes straight down to the thermostat. On your point on running cable to thermostat, why is that needed? The current thermostat cable already has 4 cores. Its just that two of them have been trimmed...

Here's the box which happens to be in a cavity where the hot water tank must have been in the past. The wire to thermostat goes down from here.

Nope, i just have a combi boiler and no hot water tank.

Here's the wiring arrangement from the boiler pcb for reference

Ah right - the two other wires have been cut short and isolated, which then means they need to be retrieved and extended. Does the following arrangement look correct to you? The brown (live) goes to L, green-yellow neutral (to be retrieved) goes to N, black goes to 3 and the grey (to be...

Hello guys I am trying to replace an old analog honeywell thermostat with an ESI programmable single channel (model: ES1247B) thermostat. Upon removing the old one, I can see brown (live) and black wires. The ESI installation guide does not offer a wiring diagram but from some research I found...