I'm doing fine now, thanks for the concern. I suppose if Polis is only that deep then the London tunnels would probably be safe, but the other issue is that according to that map the tunnels appear to resurface in a few places, even along the Circle line. I'm not exactly familiar with the layout of London so I can't confirm this one way or another, though if it does we could just say it's AU, and the underground lines are only underground, unless they transfer to an above ground line or something. And I doubt the Tube has blast doors like Moscow's Metro, so those will likely need to be added as well.

As for weapons, a majority of the weapons in Metro seemed to be hand made. The only pre-war weapons were the AK47, the Kalash 2012, the VSV, the Bulldog in Exodus, and the Saiga-12. All the rest were made from scrap basically. I believe the brits had their own assault rifles to replace these though. In a world where nukes were launched, I'm sure London probably had some kind of military presence protecting it, and thus some military grade weapons and ammunition.

Foxes might be a good start. I'll need to see what else there is.