Yes PM2.5 from woodburning is putting others at risk when there are multiple polluting burners in a small area, that's the entire point -- are you deliberately misunderstanding this, or just looking for an argument? 😞
(BTW your level of 5ug/m3 is well below the advisable "healthy/no risk" level of 12ug/m3, so I don't see what you're complaining about anyway)
https://www.indoorairhygiene.org/pm2-5-explained/
The difference is that there's no debate or difficulty or argument about where a house is located and what else is near it, and no action to be taken unless somebody breaks the law by burning wood in urban areas -- which will have to be done anyway if a ban is brought in. It's a completely different case to child benefits, so I suggest you don't try and lump the two together just because you lost that argument 🙂
Of course they could just ban *all* woodburners *everywhere*, it wouldn't bother me -- but it would genuinely cause problems for this in remote places (including boats) who rely on wood for heating. Presumably the government would also have to compensate them for the cost of installing alternative heating, which would cost a fortune.
Why would you season whole logs and then split them, that's bonkers? Far easier to split them when green and then season the split logs, for which a year is probably fine going by my experience. The places likely to be doing this (farms and isolated houses) are likely to have plenty of space for a log pile, because that's exactly what they do today.
To repeat the obvious, the number of farms/houses (and boats) we're talking about here is very small, my guess is at most 1%*** of the 35M UK houses/flats, and for this number wood is not only an acceptable solution but a good one. Like HVO -- no chance of having enough supply for 35M cars, but no problem for 35k boats which it's a great solution for.
*** found some numbers here, choose which ones you want -- I believe that "sparse setting" is the category that means "not near any other houses", and by pure coincidence these add up to 1% of the population... 😉
https://www.ons.gov.uk/file?uri=/methodology/geography/geographicalproducts/ruralurbanclassifications/2011ruralurbanclassification/rucoaleafletmay2015tcm77406351.pdf