He said repeated encounters with a stalker “must be incredibly anxiety-inducing”.

“There are clearly people with fixations, and you can never fully know where that fixation will lead until you’ve assessed that person’s state of mind – it might be declarations of undying love and sending roses, or it might be wanting to cause harm,” he said.

Mr Basu described the Home Office’s decision to conduct a review as “incredibly positive”, adding that he could not see how Harry’s risk level would have reduced since 2019.

“As one of the most recognisable men on the planet, his threat and risk will be, in my view, the same as it was in 2019. It may even have increased because of the publicity around him,” he said.