BACK TO this column’s favourite Kensington haunt Amika for this week’s Bill of the Week, after one Russian businessman decided it was champagne all round on a recent Saturday night out. Dom Perignon all the way, as it turned out, with a magnum followed by a jeroboam followed by a £12,000 bottle of the White Gold vintage, so rare it is already a collector’s item. In all the excitement, however, said businessman discovered he had “mislaid” his wallet and had to go and fetch the £20k required to settle the evening’s tab from his nearby flat. The cash was sitting, a barfly mole narrates, in the Russian’s sock drawer.