When my husband and I arrived in our adored Amsterdam on a sun-drenched schoolday afternoon — less than an hour in the air, first row on the plane, merry but not messy — we seemed all set for a brilliant time. We’re both Brexiteers and ever since Freedom Day we’ve been especially keen on European city breaks, such visits now having the pleasing feeling of a romance whose days are numbered, and from which one would be wise to squeeze the sweetness while one may.