London is largely under water. East Anglia has vanished. The Isle of Thanet is an island again. Populations in general moved to higher ground where they developed a renewed interest in traditional skills and in farming. Old fishing ports on mountainous coasts became particularly popular.
The year is 2450AD. Darwin is still taught in schools in order to promote a “survival” mindset. Those who are the most responsive to change are the ones who are most likely to survive.
In a post fossil fuel world, a post nuclear energy world, your resourcefulness determines your station in life. No telecoms, no internet, no cars, no aircraft, and a shortage of electricity. Lots of ships and lots of horses. And lots of people who know how to use them.
Territories have shrunk. Governments have changed. They’ve downsized and localised, and they are run by the people for the people. In the Post Oil Era there is ample timber in the right places and enough clean drinking water in the right places. However, there’s not enough copper. And there’s a newfound concern about the welfare of wolves.
And pirates! The communities surrounding the Irish Sea have pesky, pilfering pirates to deal with!