Despite being an American with no interest in living under a monarchy, I confess that I spent some time watching that astonishing medieval ritual of the coronation yesterday. It’s fascinating, although I resent the fact that the commentary was almost all blabbing about Harry and the balcony and almost none of it was devoted to discussing the historical context of the ceremony and explaining what it all meant, which I would have been interested to know. However, all of that is basically an entertainment pageant and as fun as it is to watch, there’s something much more important happening in Britain as this piece by David Frum points out: If you walked into a British supermarket this past winter, you were likely to see bare shelves in the salad aisle. Customers might have been limited to purchasing lettuce and tomatoes, if there were any lettuce or tomatoes to be found in the first place. Ask the grocers, and you’d hear technical explanations for the scarcity. High energy prices raised costs at British greenhouses; imports from warmer countries were curtailed by bad weather in Southern Europe. Behind all of these situational explanations, however, loomed a larger problem. From the time a tomato is harvested, every minute counts en route to the purchaser’s table. In March, the BBC reported that Britain’s departure from the European Union has added 10 to 20 minutes of additional paperwork to every truckload of tomatoes shipped from Spain—longer if the truckload mixes different produce varieties. Ten to 20 minutes…