It was a lesson etched in the political landscape, a lesson that would shape British politics for years to come, a lesson far more significant than the intricacies of any trade deal..... The fifth anniversary of Brexit arrived with a quiet unease. The Union Jacks, once so proudly waved, seemed to droop a little in the January chill. The cheers had long faded, replaced by a low hum of debate and recrimination. As Anand Menon, head of the U.K. in a Changing Europe think-tank, had pointed out, the impact had been profound, the divisions around Brexit now a permanent fixture in the political landscape. Five years ago, the moment of departure had been fraught. Flags, tears, and a sense of a leap into the unknown. Now, the unknown was the present, and its contours were proving difficult to navigate. But the real story, whispered in the corridors of power and debated in hushed tones in Westminster pubs, wasn’t just about the economic and so...