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Thanks D_Hailsham, however there is live voltage on the grey wire (as per my quoted reply), when it's sitting in mid-position, cylinder is SAT and CH is Called. I am not a trained CH engineer but I can follow schematics and the posts here...

Maybe .. is there a convention to follow there, or are you thinking full-on Dymo name labels?

Some pictures of wiring centre internals

1. Yes there is. It's a short link inside the wiring centre. 2. Yes the system runs under that condition. Voltage is present at the grey wire in the wiring centre, whether the cyl stat is set high (call) or low (sat). Part of the wiring centre detail: 16: CYL SAT .. two black wires going to...

Will investigate 1 & 2. 3. I was mistaken on - I corrected my post perhaps after you saw it. I meant to say grey + white.

I've had more of a look this morning. The motorised valve is an EPH Detach B322D. This was a replacement, fitted July 2013. Apparently has a 5-year guarantee. The wiring in the wiring centre is rather untidy, but the correct signals seem to be present on the grey, white feeds according to...

There's an audible click from the thermostat with approx 2 deg C difference. So for example - system just switched on with the stat set at 20C. Moved settings back and there was a click at around 18C. There is no neon indicator, so I don't know what's happening with it electrically, and I do...

We've got a problem with our CH/DHW which I think is likely to be a wiring issue. The system consists of an (original, 15 yrs old) timer-switch, original 15 yrs old thermostat, original wiring centre next to the (7 yr old) pump, and 6 year old Remeha Avanta 18v boiler. We found the CH to be OK...