Sir Keir Starmer and his wife Lady Victoria Starmer will visit Balmoral to stay with King Charles and Queen Camilla, the Sunday Express has learned.

It is tradition for the serving Prime Minister and his or her partner to be invited to join the monarch at Balmoral towards the end of the summer months just before Parliament is back in session. The House returns on September 2 this year.

“The prime minister and his wife received their invitation earlier this month and they accepted,” said the source.

“The Prime Minister’s team will update on his diary in the usual way at lobby.”

According to the source, the Prime Minister and his wife will be offered accommodation in the main castle while Their Majesties will reside in their private cottage on the estate, Birkhall.

If the Starmers were to stay the Friday night, it is said that the King and Queen will try to accommodate the couple’s tradition of observing the Sabbath meal.

Rishi Sunak and his wife Akshata Murty paid a visit to the Scottish castle last year, and were seen arriving at Crathie Kirk with King Charles and Queen Camilla.

Sir Keir Starmer and the monarch have known one another for exactly a decade. They first met when the then-Prince Charles knighted the Prime Minister back in 2014.

The premier was granted the honour for his work as Director of Public Prosecutions. Starmer was made a Knight Commander of the Order of the Bath during an Investiture ceremony at Buckingham Palace.

King Charles, Queen Camilla and most of the Royal Family are already on the Balmoral estate for their annual summer holiday, allowing for the occasional public engagement at the same time.

Prince William, Princess Kate and their three children – Prince George, 11, Princess Charlotte, 9, and Prince Louis, 6 – have joined the monarch along with Princess Anne and her husband Timothy Laurence.

Mike and Zara Tindall have joined with their family for some of the time.

The Duke and Duchess of Edinburgh and their children, as well as Prince Andrew and Sarah Ferguson are also in attendance. The Duke and Duchess of Sussex have not been invited.

Buckingham Palace and Number 10 have been approached for comment.