Cross Blackfriars Bridge at twilight and consider Dementors drifting above the Thames

https://troynjif294.theglensecret.com/harry-potter-london-attractions-you-can-t-miss-on-a-day-trip

Cross Blackfriars Bridge at twilight and suppose Dementors drifting above the Thames, as metropolis lighting flicker like lumos in the fog.