You have a point about the military presence, I forgot how many wrecked T-90s there are in Novosibirsk. Brits use L85s among other stuff, which is good since bullpups are great in close quarters.

London's underground is apparently longer than Moscow metro, too, though that includes the above ground lines (and since we're strongly considering an alternate reality, those may not all be above ground). Length-wise, New York might also work should London fall through ([url=https://upload.wikimedia.org/wikipedia/commons/6/61/Nyc_subway_underground_or_overground_track_position.svg]Orange = underground[/url]).