On the first Saturday of September, the sun shone happily on Highgate. The Financial Times Weekend Festival rolled back into the grounds of Kenwood House. And so did Irish Warren and I for our annual pilgrimage to North London. We’ve been making the short hop across since 2017. In the early years, Brexit loomed large. The convulsions of leaving the EU provided fresh fodder for many panel debates. The first Trump term was more a lurid fascination. The shock was real, but the substance mercifully lacking. Lots to debate; little of lasting worry. The fiery clashes about the effects of…