According to the book:
It was in the United States that the VC10 gained its street credibility. A bar on New York West's 44th Street produced the Super VC10 Cocktail - half a jigger of Cointreau, six drops of Creme de Cacao, two jiggers of brandy and a sprig of mint. It was shaken and served, julep-style, over cracked ice.
Unfortunately the name of the bar is not stated.