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Success!! Thanks guys! Located 3 unused wires behind the programmer and confirmed they were same 3 unused ones that terminated in the wiring centre. Connected one of them to terminal 1 of the programmer, and the other end of it to where the blue wire joins the grey wire in the wiring centre...

Thanks Echo. So am I effectively hoping that the blue wire (in 9th terminal from top, joined to grey wire) goes all the way to where the programmer is, and if I can locate it I need to connect it to terminal 1 (HW OFF) on the programmer? (And change the jumper over)

Thanks Jack and Echo. Here's a photo of inside the grey box: And there is a jumper on the back of the programmer, it's marked G P, so presume this is how to change it to dual channel as nothing in the menus unless it's hidden. A few further points: It is currently possible to turn ON...

I've just moved into a new house and something doesn't seem quite right with the heating system: if I turn the hot water off, and the central heating on, the hot water will turn on as well. I have a regular boiler (Potterton Prima F) with a vented cylinder. There is a mid-position valve by the...