AS THE nights draw in, four private investors were drawn to Boisdale of Belgravia for what the Scottish institution does best: some reassuringly autumnal haggis, grouse, Scotch rarebit, wild salmon and, of course, whisky. Make that three measures of Royal Salute and one of Glenlivet, thought the financiers as they digested their long Hibernian lunch in mellow mood after four bottles of wine. Not just any old bin-ends, though: one bottle of £150 Perrier Jouet Belle Epoque champagne and three bottles of 1999 Domaine de la Romanée Conti Richebourg burgundy at £350 a time. So it wasn’t just the four aged Havana cigars that went up in smoke by 2.33pm on that wintry October afternoon, but almost £2,000-worth of corporate profits as well.