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Thanks - found this:
https://nest.com/support/images/misc-nest-thermostat-eu/gen3-install/3rd-gen-Nest-Learning-Thermostat-Install-Guide-UK.pdfvoltage tester
Any recs?
I could be wrong but it's possibly only a call for heat that the thermostat receives/sends so unlikely to be a lot of amps. Not notifiable as far as I know. Obvs switch off power at the Cu and check there's no voltage with a decent voltage tester before messing with the wires.