I posted a number of people you could try, further up the discussion.
Thank you very much
When we were restoring our cottage I’d hoped to have a small Godin stove in the kitchen. It would have meant the chimney going up through the kitchen ceiling/bedroom floor above , then the height of the bedroom and up through the roof. The builders were emphasising that the metal chimney would have to have a protective “liner” around it as it went through the floor and then out through the roof, so that the floor and roof were protected from the heat of the chimney.
It all got too complicated and expensive so we never went ahead.
Maybe it’s something like this? (Not lead, obviously.)
I’d run from that plumber.
And as everyone else has said I don’t think a plumber is the trade you need.
Can you show us the quote he gave you? The arrow at the bottom right of a post when you’re writing it will upload. Does it really say he’s a plombier on it?
You can usually crop and re-save in Gallery on your phone.
I’m sure @Corona will correct me if I’m mistaken, but I’m under the impression that chimney liners should all be stainless steel these days. Single skin if it is inside an existing masonry chimney flueway, and double skinned if it goes through the interior of the building as a new flueway installation.
Ok I’ll correct you 
. The single skin is actually a double skin, class 1 liner for wood burners etc. The twin walled with insulation is the other type.
The single skin class 2 is for gas or oil boilers.
I knew that you’d know. Thanks. At least I was correct about it being Stainless Steel. 
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I’m reasonably sure that the people who fitted our wood burner and pellet stove 2 years ago used a flexible liner in the chimney, although the pipes directly onto the stoves are steel. The stoves were fitted by a recommended business - chaleur bois - from Autun (have sirets etc).
Ours is flexible in that it is “concertina” stainless steel and thus can bend as necessary. The builder doing our roof put it in the chimney for us as we talked about getting a fire.
A while later: from the fire up into this liner is one thick black unbending pipe which came with the fire (supplied and fitted by the fire-experts)
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That’s how its supposed to be done (the first section being rigid)
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