Not London. Beika-cho in Tokyo, Japan. Although the darkness and oddly warped perspectives make any distinguishing features very difficult to recognize.

Conan by this time had fallen into a kind of tunnel vision, only dragging himself one step at a time as he tried to keep himself from tripping over his two large clothing or falling due to the ever present dizziness and disorientation. But he had to keep moving. He didn't have time to worry about what had been in that poison or what it was doing to him. That man was right behind him. He was being chased, he was sure of it.