[quote=@Starlance]
Assuming they survived. Remember Kremlin from the first book? *shudders*
[/quote]

I imagine [I]some[/I] members of the House of Lords/Aristocracy might have gotten in. Monarchy maybe not - they may have been attempted to be evacuated elsewhere, who knows. But they make sense as something the London Metro residents may try to emulate - maybe one of the factions is a Kingdom, and there's Dukes and Earls and Barons (or the feminine equivalents of those titles) ruling stations as feudal lords under the authority of a monarch.

It doesn't make sense we'd see a Red Line - 2013 UK doesn't have a strong communist base to do that - but something inspired by the Monarchy would be very British.