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Further update. The vertical zone valve has the motor wired to Neutral and its Live terminal connected to the orange of the other two zone valves. So basically it opens at the same time as either of the two horizontal valves. Even more confusingly the grey and orange wires have been cut off so...

Mr Therm, thanks - the current thermostats are wired to the Live motor feeds of their respective zone valves (upper two zone valves), will check when I'm next on site how the vertical valve is triggered. I didn't get a chance to properly check how the programmer is wired but it had one cable off...

Thanks all appreciate the comments. polesapart - good idea, I'll check and report back when I'm next onsite. John D - I hadn't thought of that but yes the insulation is different but nothing looks to have been touched for years. I'm guessing it could have originally been a single zone system...

hello Hope someone can help! Fitting Hive thermostats to a large home which has a fully pumped system with dual zone central heating and hot water cylinder running off a Potterton gas boiler. Confused by the three 2-port valves which are on the flow side of the system immediately after the pump...