ONCE absorbed in the oriental-inspired boudoir, “there is no choice but to succumb to the infectious concept that is Kumo”, claims the PR fripperie for the new Knightsbridge sushi bar. For once, the froth merchants may have a point, judging by the antics of six brokers who got sucked in by the low-lit Japanese den until one in the morning on a recent Sunday night out. So what made them stay so long and – more importantly – burn through north of £2k in five hours? Warm beef salad, scallops with pak choi, fried squid and seabass fillet all played their part, but this column suspects the four bottles of pinot grigio, one of Dom Pérignon and another of the “extremely sought-after” vintage Dom Pérignon rosé may have exerted the greatest pull.