Gwyneth Paltrow likes it doubled up. Jessica Alba swears by it. And Mel B is using it in her quest to compete with her size zero singing rivals on the Spice Girls tour. Millions of British women know that it's their only salvation when squeezing into this season's waist-centric fashions. Lingerie experts estimate that up to 80 per cent of British women seek help from nylon-spandex undergarments to smooth out unwanted lumps.