Claudia Lawrence plea issued by North Yorkshire Police

Claudia was last seen and heard from on 18 March 2009 and the force said over the years, its commitment to uncover the truth of what happened has not diminished.

She was reported missing on two days afterwards, and five weeks later, North Yorkshire Police announced that the case was being treated as a suspected murder.

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Senior investigating officer Detective Superintendent Jon Sygrove said: "It is difficult to comprehend the long ordeal that Claudia's family have faced, and my thoughts are with them.

"But despite the passage of time, we are still as determined as ever to achieve justice for Claudia.

“I believe the answers that Claudia’s loved ones deserve will come from the individuals who know, or think they know, what happened to her.

"They have carried this knowledge for 17 years, and witnessed the profound pain experienced by Claudia’s family.

Today I urge them - come forward and speak to us now.

"It is never too late to do the right thing.”

A North Yorkshire Police spokesperson said: "Although the investigation has been in a reactive phase since 2017, every single new piece of information we receive is checked and evaluated against the substantial volume of evidence already gathered throughout our enquiries.

"If new information emerges that leads to a meaningful line of enquiry, we will pursue it decisively.

"Anyone with information that could assist the investigation should make a report via the North Yorkshire Police website or by calling 101 and pass details to the force control room.

"You can also give information online via the major incident public portal: https://mipp.police.uk/operation/12XN19A46-PO1

"Alternatively, you can contact Crimestoppers anonymously on 0800 555 111 or through their anonymous online form at www.crimestoppers-uk.org

"Please quote “Claudia Lawrence” when providing details."