A TV team are urging police to dig in Herefordshire to search for more victims of Herefordshire serial killer Fred West.

A new ITV documentary exploring the murders committed by Fred and Rosemary West is set to air tomorrow (September 15).

The new two-part documentary series presented by Sir Trevor McDonald and from the filmmakers behind the International Emmy nominated and Grierson shortlisted In Cold Blood, sees a team of investigators explore claims the Wests were responsible for many more murders than the 12 women and girls they are known to have killed.

Fred West committed suicide before he was brought to trial, but his wife Rose was convicted of 10 murders in 1995. There has always been a strong belief that there are many more victims.

A search was launched earlier this year at a Gloucester cafe after the documentary team raised concerns that a body may be buried beneath the floor, but nothing was found.

This new series, which will be shown on September 15 and 16, features former detective chief inspector Colin Sutton, investigative psychologist Donna Youngs, author and West expert Howard Sounes, and reporter Sir Trevor McDonald following up new leads to try to shed new light on the true number of the Wests' victims and their identities.

Wednesday's episode sees the team unearth previously unseen documents including the full statement of Fred West's ‘appropriate adult', Janet Leach, that contains details about the location of ‘the farm’, where it has long been suggested up to 20 more victims may be found.

ITV said the team had urged police to start new investigations at locations in Herefordshire and Gloucestershire, including 'Fingerpost Field' near Much Marcle, but that detectives say there is not enough evidence to do so.

The team studies newly revealed records of discussions between Fred West and his lawyer in which Fred talked about other crimes involving himself, Rose West and his brother, John West.