We will be using real world army issue weapons, but I'll allow made up pre-war guns too if it makes sense. I've just been looking up British army weapons and am going to be using about anything from 2013 or earlier. Star is right though in that Allistair's gun is handmade. Allistair does have a army issue gas mask and canteen though. Also, I won't be taking the shelf life of gas masks into account, as that would make a functional mask nearly impossible to find twenty-four years after things went to shit. The S10 masks only had a ten year life if I'm remembering right. But yeah, if you want to make up pre-war guns we can talk out your ideas. Most handmade ideas should be fine, just don't be going overboard right at the start.

As for London being in contact with others, no jammers have been built. Radios work fine to contact people outside the city. I believe Moscow only had jammers because they thought the war was still going, which to be fair, they did have neo-Nazis running through their tunnels.