Swap Nest thermostat for Drayton Wiser

[FoxFromCoalville]

Hi all
Apologies if this has been covered before I have read the previous similar threads but none of them have the exact same wiring as my current set up. I am changing my nest thermostat + heat link for a Drayton wiser kit due to the thermostat itself being in an awkward location and wanting a battery powered option. My plan is below

Wire the two live wires from heat link into live on Drayton
Wire the two neutral wires from heat link into neutral on Drayton
Wire the one common (2) wire from heat link into common (1) on Drayton
Wire the one call for heat (3) wire into on (3) on Drayton.

There is just one zone for the heating and it is a combi boiler powered by a 3A spur

 

[CountryFan]

Yep exactly that.

 

[ericmark]

I just wired in parallel and have both the Nest can be powered by USB, so can use a battery pack if you want.