Thermostat wiring

Thermostat wiring

Thermostat wiring

Hello
Can anyone help me understand how to change my RMT230 thermostat to a digital one I have bought? (Moes 009 series Gov thermostat)
It’s for my combi boiler
3 wires at in my RMT one (240v)
White=4
Brown =1
Black =3
Just not sure where they going the new thermostat
Picks below
Old thermostat and new one
Thanks so much in advance

by Karlosfandango1

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