Balmoral Castle, set in the Scottish highlands, is widely believed to have been Queen Elizabeth II's favourite residence and is where she spent most of her summers.

Guided "castle interior tours", which will take visitors to parts of the building used by the Royal Family, will now be available between 1 July and 4 August, with each group restricted to 10 people.

Tickets are priced at £100, or £150 with afternoon tea included, are limited to 40 tickets per day and are already selling fast.

The tours will end before the King and Queen arrive at Balmoral for their summer break in Aberdeenshire.

The Balmoral Castle website says the tours are the first of their kind since the building was completed in 1855.

Previous tours, which will continue, have concentrated on the grounds and gardens with access to the castle limited to the ballroom.

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The website said the new tour will "take you on a historical journey through several of the beautiful rooms within Balmoral Castle".

"You will learn about the origins of the castle and how it has been loved by generations of the Royal Family.

"Travel through time from the purchase of the Balmoral by Queen Victoria and Prince Albert, through to present day, where you can see how rooms within the castle are used today by their Majesty's The King and Queen and other members of the Royal Family."

The tour also includes access to the ballroom with a collection of the King's watercolour collection depicting scenery at Balmoral, Highgrove and Sandringham as well as a collection of outfits worn by King Charles and Queen Camilla, the late Queen and Queen Elizabeth The Queen Mother.

Queen Elizabeth II spent much of Prince Philip's last years with him at Balmoral and died there herself on 8 September 2022.