One of the projects I dabble with is to create a city in a fantasy world that could be a mirror to the one I live in.  I watched parts of the movie Peter Pan at the weekend.  It contributed to an idea that has been germinating that in such a city the elvish and fairy citizens are an artistic sub-class overlapping with criminality.  They walk among the other peoples of the city with otherworldly gifts and immortal foods that offer addiction: lotuses, viaticum, elf-shot.  They also steal children when they can, and run gangs of unageing flying thieves.  They need to policed and kept within their boundaries.

As for the image of a pirate ship riding the fog of London between the clock towers, that’s an evocative image.