There was a smell of unpleasant fire—more the acrid, plasticky smell of some kind of accidental fire than the pleasant harbourside aroma of wood-burners on narrowboats. I think the source was on the south side of the river, but I didn't have the time to find out.
There was, coincidentally, a burning BMW outside the Counts Louse today, apparently, but that would have been too far away to smell.
GPS Coordinates:
51.44642, -2.61595
Location: Hotwells & Harbourside