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And I do appreciate that everyone thinks about safety first especially we are talking about high voltage. I managed to get a multimeter and like you have said, red live, yellow switched live, blue neutral. Unfortunately after connecting the programmer like that it wasn't working, which annoyed...

I don't quite follow you. This is the picture of the Salus backplate and I intend to replace it with Honeywell. It is mounted downstairs in the living room.

I will do it tomorrow as I can't find a multimeter (facepalm) I'm guessing it's still somewhere in the boxes after the move. In the meantime, you can have a look at the pictures of the wiring that goes to the boiler, if that helps anything.

Boiler is Ideal Logic+ combi C30 I think blue is neutral and earth I'm guessing is the one hidden at the back with yellow/green sleeve I have multimeter and that it is as far as it goes to testing equipment.

I'm not able to trace it. What I think is Yellow Live, Blue Neutral Red Switched Live goest to B and then a link from "right" L to A on the back plate Is it how it should be?

I have a Salut T50 thermostat and I want to replace it with Honeywell BDR91. Look at the attache pictures and please advise how I should wire it to make it work.