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I think the 30cm rule is based upon when you open the door to replenish the firewood, you have the potential for embers to escape.
I also seem to remember from the Navitron forum that two 45degree bends, with one as soon as possible out the back of the Hobbit SE, gives a better draw than one, more distant 90 degree bend.
I seem to remember your non-combustible hearth must extend 30cm/12 inches, (in this post/prebrexit World), in all directions beyond your appliance.
The Navitron forum is a good place to get friendly help.
Do you reside in a Smoke-free Zone, (aka Smoke Control Area)?
https://www.gov.uk/smoke-control-area-rules