In article , Davey
writes

The Certified Gas Engineer who removes the existing fire should know.
As far as I know myself, having decided not to pay the massive costs
of installing a new flue for my thatched property, the problem is the
high temperatures created in the flue of a wood-burning stove, much
higher than those of a wood fire, and which are more likely to set fire
to roof timbers.

Why would a gas installer know the requirements for a woodburner?

Consider this: You don't install a flue liner, and do install the
burner. The house then catches fire, even if it has nothing to do with
the wood burner (say, a faulty electrical connection). Your insurance
company will instantly check for the flue liner, and certificate, as
soon as it sees the burner, and if it doesn't find them, will invalidate
your cover.

You're talking out of your arse.

Just my opinion.

And exceptionally badly informed.
--
fred
it's a ba-na-na . . . .