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Thanks, kevplumb, that really helps, it's pretty obvious once you see the drawing. I also found this great website with a how a motorised valve works, which might be handy for anyone else who has this problem! http://www.sobjoy.com/motorised-valve.swf

Thanks for replying so fast! Sorry, I'm a bit dim on central heating (I fix x-ray machines for a living). I'm a bit lost on the terminology (calling/satisfied) thing. I can't quite suss out how this thing works in my head. Does that mean the grey is the live feed to the cyl stat and the...

I have an old style boiler, hotwater tank and rafdiators. My radiators stopped coming on. I can turn them on using the manual lever on the motorised valve - its a Landis and gyr MAV-322, which you can´t get any more, but apparently a siemens cmv 322 is a direct replacement. I found a diagram for...