Wiring Honeywell T3R thermostat to WB greenstar30i combi

[JayN]

Hi, I am replacing old Danfoss programmer and Honeywell relay with Honeywell Home T3R thermostat.
Attached photos show the new thermostat and the current boiler layout.
Power supply to boiler seems like an easy one, but I'm a bit hazy on the connections to the thermostat.

230V out L to A and a link wire to the first L to power up
230V out N to N
LR (CH/radiator picture port) to B
Get rid of the white wire link

Would that blow up the PCB and what is the function of the second L on the stat?

Help would be greatly appreciated just so I can wrap my head around this, will probably get a heating engineer to wire it anyway as he's coming in to service the boiler.
Thanks.

 

[JayN]

Found out that the second L is the same as the first one, there for the convenience of linking L to A.

 

[JayN]

I believe I figured it out.

Boiler L out to first L
Neutral out to neutral
Earth to earth

Link from L to A
LR CH/radiator piccy to B (switch live)
Earth to earth on this 2-core also

Earth terminals getting crowded, there's three on the boiler side.

NOT to get rid of white link wire in the boiler from LR DHW and L out.

If you hear a loud bang...