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Many thanks that's explained it for me. Mick

Thanks, that's helpful. So presumably terminal 1 is ignored and 2 and 3 are wired to boiler live and live return for the nest to close a circuit and switch the boiler on. Mick

Just a thought on nest wiring - as it gets its L N E from boiler supply why does it need live supply and neutral for boiler control, surely switched live only needs to be connected to terminal 3 call for heat