The parents of killed teenager Harry Dunn plan to visit Esher and Walton this evening (November 25) and say they hope to convince residents to back one of his rivals for the seat at the upcoming general election.

In a statement ahead of the Surrey constituency visit, Tim Dunn and Charlotte Charles said they plan to confront the Foreign Secretary on why he "steadfastly refuses to publicly call for Mrs Sacoolas to be returned to the UK".

In a statement released Monday, Harry's parents said:

"We are not political people. Whatever political thoughts we hold we generally keep to ourselves.

"But the enormity and shocking nature of what has happened to us have left us feeling compelled to come to Esher and Walton this evening in the midst of the current election campaign.

"We feel that his handling of our situation has been so outrageously dishonourable and disrespectful that we have a duty to respectfully bring these matters to the direct attention of that local community that have until now voted him into this position."

Surrey Comet: The family of Harry Dunn and spokesman Radd Seige (PA)The family of Harry Dunn and spokesman Radd Seige (PA)

Harry Dunn was killed when his motorbike was involved in a head-on crash with a car outside RAF Croughton in Northamptonshire on August 27.

The primary suspect for the driver of the car is Anne Sacoolas, the wife of a US diplomat who later left the UK and returned to the US.

Mr Dunn and Mrs Charles met with Mr Raab after Harry died in the hopes that the Foreign and Commonwealth Office (FCO) could help convince Mrs Sacoolas to cooperate with British Police's investigation into Harry's death.

After the meeting, their lawyer told the BBC's Victoria Derbyshire the encounter with Mr Raab had been "catastrophically bad".

A claim by the family, which alleged that the granting of diplomatic immunity to Mrs Sacoolas was legally "wrong" was met with resistance from the FCO.

The FCO told the family it would oppose their claim and seek costs for any legal action.

There are hustings at the East Molesey Methodist Church from 7.30pm tonight, though the presence of Mr Dunn and Mrs Charles was not confirmed.

"Although we do not take part in any form of party politics, we invite people, irrespective of how they normally vote, to consider very carefully how they cast their vote on 12th December," Mr Dunn and Mrs Charles said.

"This is not about left or right. It's about trust and right versus wrong.

"People will need to form their own judgements of course but given our experience of Mr Raab's behaviour, we strongly believe that he is not worthy of holding public office.

"We would hate for any family to suffer at his hands as we have. We would encourage the constituency to vote for his strongest challenger who we understand is Monica Harding."

The statement added: "They and the nation need to know the real facts of what has happened and the disgraceful manner in which Mr Raab has behaved and we look forward to meeting with them. Harry would expect nothing less of us."