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Yes but one of those might go direct to the boiler and you might not want to wire to that depending on how confident you are. You will need a new connection from what is currently terminal 4 to your boiler demand terminal too. Likely to be fairly easy if the programmer and boiler are next to each other, not so much if they are in different parts of the house.
jellybaby
Do you think I could use the wires that go to the current thermo to power the nest by linking them to the T1 and T2 on the heat link.