Spice Girls will reunite for a film sequel to Spice World, according to sources.A film industry source has told The Sun that four members of the band – Geri Horner (Ginger Spice), Melanie C (Sport Spice), Mel Burton (Scary Spice), and Emma Bunton (Baby Spice) – have approached a screenwriter about devising a follow-up to their 1997 film.The reported project is to help mark the group’s 25th anniversary next year.