It might well be that Autumn is, as Keats put it, the "Season of mists" but this morning was spectacularly misty.
It seemed to roll in downriver along with the morning river taxi, which appeared out of clouds of fog like the vessel that ferries the dead across the river of the underworld to Hades.
Though I doubt that ferry serves free tea and coffee nor offers a discount for those in possession of a valid Transport for London Oyster card!