Replacing LP111Si programmer with Hive V4 mini receiver

[sunnyj58]

Hey all, wondering if anyone can help me out a little here. I currently have a LP111Si programmer which I want to replace with a V4 Hive mini, so that I can remove the old thermostat and a LOT of trunking that goes around the room.

Can anyone help me with the wiring and where things should go?
For context, the greyish bottom wire comes from the mains, the white middle wire goes to the boiler, and the top darker wire is the one that goes off to the thermostat.

 

[CountryFan]

I'm guessing a combi boiler. The black that is with the boiler white cable should be the switch live, which would then go to terminal 3 on Hive, decomission the thermostat wires and leave the red link in place. Hive should clip onto that backplate