Prostitutes and bikers could hold the key to the “missing years” of serial killer Peter Tobin’s life.

Detectives want the public’s help filling the gaps in their knowledge about Tobin, who lived in Sussex throughout the late 1960s, 1970s and 1980s, to help discover if he had murdered before.

They have revealed he used a string of aliases while criss-crossing the country in the years before he is first known to have killed.

While his entire career is under investigation, police have particularly scant information about the years 1977, 1978, 1985 and 1986 - four years when he had links to Sussex.

Tobin is serving three life sentences, for the murders of Vicky Hamilton, 15, and Dinah McNicol, 18, in 1991 and Angelika Kluk, 23, in 2006.

The 63-year-old first moved to Sussex in 1969 and lived in flats around the Brighton and Hove over the next 20 years.

He is known to have lived in Dyke Road, Regency Square, Grand Parade, Albourne Close, Eastern Street and Chadborn Close in Brighton and Station Road, Portslade.

Anyone with information is asked to call Sussex Police on 0845 6070999 or Crimestoppers anonymously on 0800 555111.