Change Honeywell BDR91 receiver to Hive, wiring question

[joinerjoe]

Hi,
My boiler is the Worcester Bosch Greenstar CDi 29 Classic which is installed in the loft. It has the Honeywell BDR91 Wireless Relay Box located between the boiler and the fused spur. The programmable wireless room thermostat, CENTER EHE0200361 RF is in the hallway. I want to replace this setup for the hive V4 single channel thermostat. I would appreciate clarification regarding the wiring please. I have seen similar requests for this on other posts but would like specific instructions please.

I’ve attached a couple photos including the wiring to the BDR9.

 

[denso13]

The blue wires go to N as they do now
The brown wires go to L as they do now
The grey wire in A goes to 1 on the Hive (com)
The black wire in B goes to 3 on the Hive (heating on)

 

[joinerjoe]

The blue wires go to N as they do now
The brown wires go to L as they do now
The grey wire in A goes to 1 on the Hive (com)
The black wire in B goes to 3 on the Hive (heating on)

Thanks, I do appreciated your reply.
I was looking at the other posts on the same subject, most have a single cable entering the BDR91 from the boiler whereas I have two. I take it that this is just another way of wiring up to the boiler?
I noticed too on my installation that both positives wires have been secured to a single L terminal even though there are two available. Could both have been used, or is there some reason for using just the one?
Thanks

 

[CountryFan]

I was looking at the other posts on the same subject, most have a single cable entering the BDR91 from the boiler whereas I have two. I take it that this is just another way of wiring up to the boiler?

Correct

Could both have been used, or is there some reason for using just the one?

Both could have been used, but they still have to get 2 in the neutral, and that L is often used to bridge to A if required