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This is what I'm attaching it to, there's a wiring diagram on p22, looks ok I think: http://www.gledhill.net/water-storage/downloads/technical-manuals/boilermatemain.pdf Thanks again :D (This is where I saw the CM67 RF was being replaced, oilman)...

Thanks EliteHeat, I see how it can be done now, I'll have a look at the wires on the old programmer later today.

If anyone could point me in the right direstion here I'd be really grateful... I've just bought a Honeywell CMT927 wireless programmable room thermostat which I think is the new version of the CM67 RF. It's to replace a simple mechanical dial thermostat which has four wires attached, earth...