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Thanks for advice. Couldn't find a model number on the old Landis & Gyr stat. However was advised to swap 3 wire Drayton model for a 2 wire. Instructions pretty clear and have fitted this one successfully. Red live, black as call signal. Thermostat & heating seem to be running OK. Thanks again.

Hello. I am replacing an old Landis & Gyr room thermostat with a Drayton RTS1. The current wiring on the old stat is red, black and blue. Red is live, The blue is wired into the earth position, so I presume that in this set up the black wire is neutral. Our new Drayton is double insulated so...