Serial killer Jeremy Bamber claims new evidence of a telephone call he made proves he didn't murder his family.

Bamber, 58, who has served 33 years in jail, believes an unearthed police telephone record shows he was elsewhere at the time of the killings.

Bamber was convicted of shooting dead his parents Nevill and June, both 61, at White House Farm, Essex, along with his model sister Sheila "Bambi" Caffell, 26, and her six-year-old twins Daniel and Nicholas in August 1985.

Bamber's legal team at Quality Solicitors Jordans, who said work is under way to try and secure an appeal, described the case for appeal as "complex", but said if successful it "would be one of the UK's most notorious miscarriages of justice".

Bamber had argued two calls were made to police on the night of the murders, one from himself and another from his father, but the prosecution at his trial had alleged there was only one which was made by Bamber at 3.26am from the scene.

The new note is said to refer to a call, timed at "approximately 3.37am", from Bamber.

His legal team argue it shows Bamber could not have made a 3.26am call from the farm and returned to his home 3.5 miles away in Goldhanger to make the second call, the Daily Mirror reported.