Well they always do a chimney pressure test if you put in or change your wood burner/chimney, in my case they only come and sweep the chimney every three years since it's only used during the summer month, the others must do it every year.
I can even get permission to chimney sweep myself if I apply.
I think the chimney sweeper makes a ocular inspection every time he comes.
They are quite good at it, I remember ones I was looking for buying a house then I called the master chimney sweeper in the area and asked him about the condition of the chimney he knew exactly what condition it was, saying the old man who lived there was burning the fire to hot almost gott a chimney burn
Here they fix bad chimneys with inside pipes, linings or slip casting.
If there is unused pipes in the chimney, they can be used as ventilation shafts here if it is done right.
Well I can understand there concern in the beginning here they made the houses super airtight and the ventilation didn't keep up and there was a lot of problems before they got right, but now there is a lo info so tit would not be a problem.
Best Regards A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein