On 23/12/2020 01:22, wrote:
We have a large'ish open fire and I'm tempted to make, or to get made,
something to close-off the chimney when the fire isn't in use (which is
most of the time). Has anyone here done the same?

(Yes, I know I could fit a wood burner but it's a large fire in a formal
room and it just wouldn't look right - according to SWMBO)

I have used these
https://www.chimneysheep.co.uk/
and they seem to do the job (keep the draughts out).
They may be something of a gimmick (cue sheep jokes) and I have no idea
if there's a better option, but they tick a few boxes for me.
I have no connection with the company mentioned other than as a buyer of
their products.