Her celebrity fans, who range from Angelina Jolie to the Duchess of Cambridge, depend on Jenny Packham for red carpet-friendly evening gowns and cocktail dresses with plenty of sparkle. And sparkle they did in a collection that was a tour of silver-screen glamour, from flapper silhouettes and art deco embroidery to goddess dresses from Hollywood’s golden years. Far from nostalgic, however, the effect was thoroughly modern.