Thanks for the response, appreciate it!

Did you install your own? I have a chimney but think it needs some TLC before putting it back to use.

I've been looking into some so far and have been able to distinguish between catalytic and non-catalytic, is that what you are referring to? Or is the "afterburner" technology something else?

Been looking at some reviews and comparisons, this one in particular talks about non-catalytic vs catalytic: https://heattalk.com/best-wood-stove-reviews/

But in terms of use, are we free to use them however we want or does it depend on your local authority etc?