Question Nest install w/ conventional Y boiler system and wireless BDR91 transmitter


Novice Member
I have got myself a nest thermostat which comes with the supplied heatlink and hoping to install it myself. I am pretty certain on how to install and which wires go where but have found a wireless transmitter (bdr91) which I believe communicates with the Thermostat in the hallway.
This isnt located near the panel with the hot water and heating controls and I am unsure whether i need to decommission this and remove all the wires before installing the nest, or can I Just cap the wires off? Ill attach photos. Thanks

to add: I have included a picture of the wiring of the main unit and wondering why I have two wires to each L and N?


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