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I had a thought on my idea about controlling the boiler directly via Pin 4. Though it should work for old gas boilers and any oil boiler, new gas boilers contain a lot more electronics and may not like being frequently power-cycled; they may go through a lengthy initialisation. (I don't have...

The WT714R (one channel) hub does what you want. It has relay connections that are 'voltage free', so it's just a switch. Pins 1 and 3 on that hub form a simple switch, that closes when heat is demanded. The WT724R (two channel) hub has one side of each relay contact internally connected to the...

On that hub, Pin 4 goes LIVE (230VAC) when there is demand for heat. So I would say just PIN 4 and Neutral direct to the Boiler&Pump. (Assuming there are no motorised valves that need to be energised). I think :) PIN 1 goes LIVE when HW is OFF PIN 2 goes LIVE when CH is OFF PIN 3 goes LIVE...

Do you need anything else, or can I re-assemble the hub? :)

Most of those components have no markings. My Brymen BM235 says they have no resistance either! (well maybe 0.001Ω) - so are they just links?