thank you for this - will see what i can doAs already said you seem to be struggling with this, here is a wiring diagram to see if that helps if not I suggest you throw the towel in, the central heating zone valves can just be hooked open permanently and you need to remove the 24v link on the pcb.
the two red dots on the diagram show where you have to run a wire through the unvented stat (to comply with g3 regs) and a disclaimer the diagram is the way I would wire it up but I am not working on your heating system so it may not suit, the responability is yours.
View attachment 196045
I was going to lock open the CH Valves but was told that in doing so will only half open them, is this correct?
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