TODAY marks eleven years since the last sighting of Claudia Lawrence.

On the anniversary of her disappearance, her father Peter Lawrence, 73, spoke to the Northern Echo of the 'rollercoaster' he and has family have been put through for over a decade.

The York University chef was last seen on March 18, 2009, and police believe she has been murdered, although no body has ever been discovered. She was 35 when she vanished.

Her father said that despite the lack of answers he has received over the years, he still remains hopeful that someone will "finally have a conscience" and come forward with information to the police.

"It is a very old, emotional plea now, but I'll never stop asking whoever knows what's happened to Claudia to please tell us," said Mr Lawrence.

"The worst part for her family is the lack of closure, it eats into you after 11 years and that is torturous. Until we find out, that pain will just go on and on."

Mr Lawrence, who had spoken to Claudia the night before she failed to turn up for an early-morning shift at a University of York canteen on March 19, said whether his daughter is "dead or alive", he just wants to find closure by knowing the truth.

A retired solicitor, 73-year-old Mr Lawrence has put himself in the public eye frequently since her disappearance, in order to keep Claudia's name and face memorable.

"I've seen over the years that when Claudia's story is circulated in the media, the police do receive more calls regarding her, which is why it's important we keep it fresh in people's heads.

"We just need to wait for the right phone call to come through."

Since his daughter disappearance, Mr Lawrence has become a ambassador for the Missing People charity, and passed ‘Claudia’s Law’ last year, which gives families with missing loved ones the ability to safeguard their loved one’s assets and property in their absence, for example suspending direct debits for utility bills, or making mortgage payments, which before the law they were unable to do.

"People are actually using the law, which is gratifying. The first case was in Leeds, which was close to home," said Mr Lawrence.

Eleven years on, Claudia's father said he still holds out hope that she is alive.

"I still believe she could come home," he said, "in the absence of any concrete evidence, there is still hope."

If you have any information that could assist the investigation, please contact North Yorkshire Police on 101, select option 1, and pass details to the Force Control Room, quoting "Claudia Lawrence".

If you would prefer to remain anonymous, please pass information to the independent charity Crimestoppers on 0800 555 111,quoting “Claudia Lawrence, North Yorkshire Police“.