Those towering stiletto mules. That beehive weighing her down.... We've often wondered just how Amy Winehouse manages to scamper around the stage without losing her shoes. Her secret, confides cult shoe designer Terry De Havilland, is in a clever little gadget called the ‘springolator': a piece of elastic stitched into the waist of the shoes (the narrowest part of the sole). ‘It's not my invention,' the designer admitted when Grazia's Style Director Paula Reed popped into his studio today. ‘It's actually something that was pretty standard in the 50's, but somehow it died out. The elastic makes the mule snap back to your foot when you lift it to take a step.' Simple! And we have seen it in action and can bear witness that it works exactly as he says it does. Utterly Genius! ‘But the most fabulous thing about it,' smiles Mr De H dreamily, ‘is the sexy slap slap noise it makes as a woman walks. I love that.' And we love anything that gets Amy up on stage.