Prince Harry has flown to the UK to unveil a statue to commemorate the 60th birthday of his late mother, Diana, Princess of Wales.

The Duke of Sussex arrived at London's Heathrow Airport alone on Friday afternoon local time, leaving wife Meghan back at their Californian home with son Archie, two, and newborn daughter Lilibet. He was driven under police escort to Frogmore Cottage, in the grounds of the royal estate at Windsor, where he will isolate for five days before taking a Covid-19 test.

Kensington Palace confirmed Harry, 36, would join older brother Prince William in the gardens of the palace on July 1 for a "small event" for the unveiling.

"Prince William and Prince Harry will attend a small event to mark the unveiling of a statue they commissioned of their mother, Diana, Princess of Wales, in the Sunken Garden at Kensington Palace," a statement from Kensington Palace said. "In addition to close family of Diana, Princess of Wales, members of the statue committee, the sculptor Ian Rank-Broadley, and garden designer Pip Morrison will also be present."

It will be the first time the brothers have seen each other since the funeral of their grandfather Prince Philip, the Duke of Edinburgh, in April. The brothers commissioned the statue in 2017, the 20th anniversary of Princess Diana's death, by forming a committee and privately raising funds for it.

Princess Diana was killed alongside Dodi al-Fayed when the car they were being driven in crashed in a Paris tunnel in 1997, while it was being chased by photographers. The driver of the vehicle, Henri Paul, was also killed in the accident, though, the pair's bodyguard survived.

Prince William was 15 and Prince Harry, 12, at the time. "It has been 20 years since our mother's death and the time is right to recognise her positive impact in the UK and around the world with a permanent statue," Prince William said in a statement when the statue was announced in 2017.