© under license to London News Pictures.  24/03/2011. Plice search a field in Uffington, Oxfordshire for the body of  22 year-old Sian O'Callaghan who was last seen alive at SUJU nightclub in Swindon, WIlts. Taxi driver Christopher Halliwell has been charged with the murder of Sian O"Callaghan.  Photo credit should read: LNP..