Cool
I can make some maps for this if you want.
Reminds me of something I wrote, but never finished, about a year ago; a timeline based on the idea (which, like all such ideas, is absurd) that after the War, Britain became a Republic (fitting in with the general absurdity, the entire Royal Family, except for a certain former King with pro-Nazi leanings, was killed during the War) aquired a multi-party (as opposed to the two-and-a-half system we have in reality) system.
Sadly, it fell victim to my astonishing ability to lose files... I'll post it if I ever find it.