I defo did a tightness test! And I didn't leave pipes lite that, it takes lots of work to get pipes like that, a highly skilled coppersmith would struggle to re create.
First call this morning. Could see the fumes coming in the window. Flue is an old Worcester one but boiler is only a couple of years old. There is a balcony above as well. IDed it and going back tomorrow to put a new flue and plume kit on.
dont know if you find the same tom,admittedly its mainly icos i see so not as stressed as a isar,but if its stripped down every year and the ionization probes or pins are checked for condition and correct location they dont need changing obviously different story if there damaged that goes for insulation as well if its cracked new expensive one piece affair required