Just as per the Hive instructions, live and neutral to L and N, room stat connection on boiler to 1 and 3. Remove existing boiler link, if there is one, across room stat connections in boiler.
Take the live and neutral for the Hive from the same connections as the mains feed, either at the boiler terminal strip or at the supply end.
The 1 and 3 from the Hive will connect to the room stat connections on the boiler terminal strip, replacing the ones already connected. You could also use Opentherm if the Hive is the latest version.
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