Installing a nest thermostat e with heat link

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Hi I'm struggling to identify what wires are the common and the normally open wire on my drayton rts 9 thermostat so I can install the nest thermostat e with heat link. I have attached a photo of my thermostat and the wires.
20201010_180318.jpg
 
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Does that white cable from the backplate go to a wiring centre (junction box) near the boiler?
If so can you post some pictures? That would normally be the best place to install the Heatlink.
 
The two wires I have marked go into COM and NO on the nest E, all other wires need to be safely terminated and isolated, DO NOT MAKE ANY links, it doesnt matter which way round the two wires are it is simply a switch.

Inkednest e_LI.jpg
 
Thank you ianmcd will give it a go. But how could you tell what was what wire I forgot to upload a picture of the diagram on the inside of the old thermostat case.
 
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Hi thank you again for your help really appreciate it. I have fitted it and all working so far so good and with no issues
 

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