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I did post this on the last page. Studies tend to be UK-wide. The one you keep banging on about was UK-wide. There was a detailed study in 2014 that showed log fires contributed 7-9% of PM10 in London specifically. Since then sales of log burners have risen, consumption of wood fuel has risen and car emissions have dropped as a result of ULEZ and cleaner engines.
https://www.sciencedirect.com/science/article/pii/S1352231013009825
You might be surprised that wood burning is such a large contributor but the science is pretty solid: burning wood is hugely inefficient and pumps out a lot of particulate pollution. When London is fully switched over to electric vehicles then it's going to be an enormous percentage of the overall air pollution problem. There's also the issue that this is mostly down to middle-class hygge burning - it's an aesthetic choice.
I'm not outing myself as a wood burner advocate here BTW! I am just trying to validate my astonishment that Wood Burning stoves are "the main source to London pollution" as per Sparky's comment.