Senoufou. The sale of creosote is now fairly tightly controlled in the uk. I should have a quiet word with your local environmental health officer(or whatever he may be called now.) Wood smoke is barely permissable, other potentially carcinogenic pollutants are not.

As an example below:(I am not familiar with ukEU legislationd

https://www.atsdr.cdc.gov/sites/KerrMcGee/docs/Creosote%20Health%20Effects%20(Tronox).pdf

Some place consider burning treated wood a major issue:


http://www.lcaqmd.net/DangeroustoBurnTreated.htm