Meghan Markle has been warned to think twice before joining her husband Prince Harry on his upcoming visit to the United Kingdom.

The Duke of Sussex is expected to return to Britain in early May for celebrations marking the10th anniversary of the Invictus Games – with a trip that will include a special service at St Paul’s Cathedral on May 8.

Harry is reportedly also planning a “surprise” gesture in a bid to reconcile with his brother Prince William during on the trip.

While it is still unclear whether Meghan will join her husband on the trip, respected royals expert Richard Fitzwilliams has warned she is unlikely to receive a cordial welcome if rumours are correct and she decides to go.

“If she comes there will be a huge amount of adverse publicity because of the way she has acted for the past four years,” Fitzwilliams told UK newspaper The Sun.

Harry reportedly has “anxiety” about the trip and the St Paul’s Cathedral celebration due to “regretful” sensitive information he shared in his memoir, Spare.

In the book, the Duke of Sussex wrote that he killed some 25 Taliban fighters during his tour of duty in Afghanistan.

Fitzwilliams said that while he believed security “wouldn’t be an issue” should Meghan choose to visit, she also has the “perfect excuse” not to return to the UK.

“I think security could be used as an excuse not to come,” he said.

Harry’s visit will be his first to Britain since the Princess of Wales revealed she is receiving preventive chemotherapy for cancer. Fitzwilliams said her illness could help reconcile Harry with his older brother.

“Serious illness is the big changer. Despite everything that’s happened, given the seriousness of the situation, anything can happen,” he said.

“There could be something that surprises us all. You could have all the Sussexes over here, it’s perfectly possible a reunion could happen.”

Harry and Meghan have had mixed success in parlaying their royal titles into celebrity fortunes since leaving the UK and settling in the US in 2020.

The couple have upset the British public and reportedly the royal family with a serious of unflattering claims in podcasts, tell-all interviews and Spare.

In December the Sussexes were named the “biggest losers” of 2023 in an annual showbiz list compiled by one of Hollywood’s most respected entertainment publications.

The Hollywood Reporter slammed the duke and duchess for their “whiny” biographies.

“In 2020, the royal duo fled a life of ceremonial public service to cash in their celebrity status in the states.

“But after a whiny Netflix documentary, a whiny biography (Spare – even the title is a pouty gripe) and an inert podcast, the Harry and Meghan brand swelled into a sanctimonious bubble just begging to be popped – and South Park was the pin,” it wrote.