Prince Harry and Meghan Markle feared Archie and Lilibet's British passports were being held up at the behest of their grandfather the King over the use of their HRH titles, it was claimed today.

The Sussexes are said to have become 'exasperated' about waiting months for their children's passports to arrive and believed it was being 'blocked' due to the use of their royal titles.

The couple thought the application would take weeks and suspected it was because they wanted HRH on Archie and Lilibet's British travel documents. They then began exploring changing their surname to Spencer - a nod to Princess Diana, as revealed by The Mail on Sunday.

'The King hadn't wanted Archie and Lili to carry the titles, most of all the HRH, and the British passports, once created, would be the first and perhaps the only legal proof of their names', a source close to Harry and Meghan reportedly told The Guardian.

'There was clear reluctance to issue passports for the kids'.