The dad of missing student Sophie Smith has issued a heartbreaking appeal for her to return home as police admit hopes of finding her alive are "diminishing". Detectives say they have now discovered a possible CCTV image of the 21-year-old walking towards the seafront in her home town Gorleston, Norfolk. Report by Chulanin. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn