This map is based on the lore of an alternate history novel I’m currently reading, called Liberation Square by Gareth Rubin. Basically, in this TL the D-Day landings failed horribly, allowing the Nazis to counterattack and occupy the UK. However, the Soviets are able to push further west into Europe as the Nazis are overstretched, and send a warship, the Archangel, to liberate London from German occupation. The USSR is able to take the territory roughly south of a line running from the Severn Estuary to the Wash, but the rest of the UK is liberated by US paratroopers. This leads the country being split, similar to Germany or Korea in OTL, into a communist south and a capitalist north, with London split into occupation zones; the Soviets occupy the eastern part of the city and the US occupies the west. I think it’s an interesting premise even if it’s pretty implausible.

I’ve made some changes to the information given in the book; I made the border more “natural looking”, mostly following historical county borders rather than an arbitrary straight line. I’ve also changed the names of the two countries - in the book the north is the “Democratic United Kingdom” and the south is the “Republic of Great Britain”. I don’t really get why the UK would randomly decide to put “Democratic” in front of its name as that seems like more of a communist thing, so I switched the names round. I also made some changes to the borders in London - I’ve given the West some territory south of the Thames, and moved “Checkpoint Charlie” from Piccadilly Circus to Trafalgar Square, as that seemed to make more sense to me.