Honeywell BDR91 to hive

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Hello,

Looking to upgrade thermostat. I have a valliant combi boiler and it has honeywell BDR91 installed with CM927 . Please see the picture of the wiring.

Can someone guide me which Hive to buy from amazon as there are so many options and how to connect the wires.

Thanks
 

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As you don't mention any hot water control, I assume the BDR91 is connected to a combi boiler, and that you don't have a hot water cylinder. If that's right you require the Single Channel Version of the Hive, and it connects as follows:

Blue now in N to Hive N
Brown now in L to Hive L
Black wire now in A = Hive Heating on 3
Use the link wire to join Hive L to Hive Com 1
 

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