Boiler lagging plates (as he called them) are the bits that go in front of the electrodes and burner.
The boiler was always in comfort mode in the past but this didn't mean the boiler was constantly on. It's the kinds of thing you notice in that when on, it makes a noise...
We have an Ariston microGENUS HE boiler and last week it kept cutting out. The plumber told us it needed a new detection electrode. He replaced this and then 'serviced' the boiler although this appeared to mean taking a reading from the gas meter and nothing more!
Since he has made this...