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dst2
I've never done it but that's my understanding yes.
Your current connection panel looks like the usual British Gas/Landis&Gyr/Horstmann etc. Live and Neutral are labelled. 3 is HW on and 4 is CH on. So current 3 goes to Nest heat link 6 and 4 goes to 3. Connect the two wires at the thermostat together with a wago block or similar.
You need to get power to the Nest somehow. That can be from the Heat Link or I assume a back of plug PSU?
Edit: You probably need to take a link from live to the two common connections on the Heat Link (2 & 5).