Change Honeywell BDR91 receiver to Hive, wiring question for combi boiler

[Geewhizz27]

My first post here. So please be kind.

I have a combi Worcester boiler with a mt10 timer. I currently have a Honeywell thermostat and receiver BDR91 (receiver below boiler) to control the temperature in home , I use timer to set when on/off and thermostat to control the temperature.
Should add that I also have a fused switch (for pilot ?) so guessing this could be the extra wires.

I want more control so have purchased a hive mini thermostat set with receiver and hub.
I can easily set up the thermostat and hub but not sure on the wiring for the hive receiver (as 2 x N and 2 x L wires)
I have attached pictures of boiler, timer and the wiring in the Honeywell receiver.
I’m guessing that I will just leave the timer as always on when set up with hive - and then just set scheduling and temp with the Hive.

Can I just check if it’s as simple as moving
Both N from BDR91 to the N in the Hive
Both individual L from BDR91 to the L in the Hive
The wire in A in BDR91 (black in this case) to 1 in Hive
The wire in B in BDR91 (grey in this case) to 3 in Hive

Should I try and move the earth cable in the block at back to the earth connection in Hive, if it’s not long enough can I leave in block (as is now) ?

And as mentioned is other posts should I be concerned with Voltage and can I mess it up badly if I get it wrong?


Thank you in advance

 

[cross thread]

Replace live and neutral in existing to LN on hive ,black into 1 grey into 3
Leave built in clock on constant

 

[CountryFan]

The fused switch (not for the pilot) looks like it’s wired through the bdr, but do as above is fine. The other L need to go in with L too. Just swapping wires over, and the right hand ones and Hive single channel are volt free, so should be fine and not mess up.