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Thanks JohnD, the new thermostat is fully plastic with no provision for earth, so I'll give the black a go as live out. Thanks for your help.

Have been looking around the internet but can't find any so am hoping someone here can help. I have an Idealmexico boiler with a switchmaster sm805 programmer connected to a Landis and Gyr thermostat. I would like to change the thermostat to the new Honeywell CM61 that I have bought...