Time Magazine: David Leroy, owner of one of London’s hottest sushi restaurants, Chisou, is on his last tuna and when that goes he has no way of getting any more. “One of our tuna suppliers just called and said they have no more until flights resume,” Leroy says, shaking his head. He’s already run out of sea urchin, monkfish liver and scallops. Mike Elgin, one of 54 fish sellers at London’s massive Billingsgate fish market, which usually moves nearly 100 tons of fish a day, would love to sell Leroy a …