The parents of Harry Dunn have accused the British government of abandoning them during their visit to the United States, saying they believe the Foreign Office “just want us to go away and forget about it all”.

Charlotte Charles and Tim Dunn will leave the US on Friday, at the end of a whirlwind five-day trip pleading with the US authorities to send their son’s killer back to Britain to face justice.

The pair told The Telegraph they have been dismayed by the lack of support from the British government.

“We don’t understand why,” said Mr Dunn. “Harry has died in an accident, and we feel that nobody but us wants to get justice for him.”

Mrs Charles said it was remarkable that they were invited by Donald Trump to the White House, on Tuesday evening, and yet were not offered support by their own embassy or consulate.