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Thanks, just one more question, where would the switched live go on the new thermostat?

This is the original thermostat wiring, the yellow wire isn't used but is still there

It was a old honeywell thermostat with a dial with just a live and neutral

I have a refoss mts200 smart thermostat, ive wired it in and now the voltage keeps dropping every three seconds or so, therfore the thermostat keep coming on and off, ive put my multimeter on the terminals and the voltage is up and down but its steady with the old thermostat connected.