Foggy London grey, the kind that wraps around official doors.
Downing Street is a cool grey.
It can be described as cool, muted, greyish and dusty.
Set in white, because white reads best on it.
Downing Street is a gated street in Westminster in London that houses the official residences and offices of the Prime Minister of the United Kingdom and the Chancellor of the Exchequer in a cul-de-sac situated off Whitehall. It is 200 metres (660 ft) long, and a few minutes' walk from the Houses of Parliament. Downing Street was developed in the 1680s by Sir George Downing.
Read on WikipediaA street is a public thoroughfare in a city, town or village, typically lined with buildings on one or both sides. Streets often include pavements (sidewalks), pedestrian crossings, and sometimes amenities like streetlights or benches. A street can be as simple as a level patch of dirt, but is more often paved with a hard, durable surface such as tarmac, concrete, cobblestone or brick. It can be designed for both social activity and movement.
Read on WikipediaProper noun