At which point everything collapses--not just London. And what does the rest of the British isles have that the EU or US can't get elsewhere, better? And you

At which point everything collapses--not just London. And what does the rest of the British isles have that the EU or US can't get elsewhere, better? And you would be relying on "modern norms" to protect you against someone invading the isles, exterminating everybody and taking over. This is something people don't seem to get--anarchy sounds nice to lots of people. However, everything doesn't just keep going--everything suddenly stops. Maybe what emerges on the other side on anarchy is better for "the people" (history suggests that the probabilities are against it), but there's a lot of bloodshed and starvation in the meantime. You may get your pound of flesh but will you be alive to appreciate that fact?