It was once described by King Charles as ‘a unique haven of cosiness’.

Birkhall, on the Balmoral estate in Scotland, was the holiday home of the Queen Mother and has long been a favourite of His Majesty.

So it is no surprise that one source said it is ‘as close as it comes’ to being a marital home for Charles and Queen Camilla.

It was where the couple enjoyed their honeymoon in 2005 and, in recent weeks, has been the perfect retreat for the the King as he continues his cancer treatment.

But Birkhall hasn’t just been favoured by Charles and Camilla – it was also a honeymoon haven for Queen Elizabeth II and Prince Philip, Prince Edward and Sophie, the Duke and Duchess of Kent and Princess Alexandra and Angus Ogilvy.

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It was once described by King Charles as ‘a unique haven of cosiness’. Birkhall, on the Balmoral estate in Scotland, was the holiday home of the Queen Mother and has long been a favourite of His Majesty. Above: Charles and Camilla at Birkhall in 2020

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It is no surprise that one source said it is ‘as close as it comes’ to being a marital home for Charles and Queen Camilla

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Charles and Camilla enjoyed their honeymoon at Birkhall in 2005. Above: the couple on their way to the estate shortly after their wedding

It boasts tartan walls, carpets and big open fires – giving it the feel of a normal house rather than a royal residence.

Since his diagnosis in February, Charles and Camilla have spent time there gardening, walking and hosting close friends.

When his mother was on her death bed at Balmoral on September 8, 2022, Charles retreated to Birkhall to pick mushrooms in the surrounding woods.

The then Prince of Wales got back to her bedside before she died, and then returned to Birkhall as the new King that evening.

The grieving monarch had a private dinner there with Camilla and Prince William.

A source told the Mail on Sunday last month that even the typically unreliable Scottish climate has not stopped Charles and Camilla from enjoying themselves outdoors at Birkhall in recent weeks.

‘Mixed weather doesn’t stop them,’ they said. ‘It’s been a really special time, coming in the wake of their wedding anniversary and reflecting on the anniversary of the Coronation.’

Camilla has previously described gardening as ‘the most relaxing thing in the world.’

The vegetable patch at Birkhall grows peas, beans, spinach and potatoes, along with more exotic fennel, fraises des bois and dahlias.

‘My husband is an excellent gardener, and we’re quite competitive about our fruit and vegetables,’ Camilla said in an interview.

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Prince William and Prince Harry with their father at Birkhall in June 1994. The image was posted by King Charles to mark Father’s Day in 2022

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Charles, then the Prince of Wales, at a ceremony at Birkhall to present medals to soldiers from the 51st Highland, 7th Battalion, The Royal Regiment of Scotland, 2012

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Queen Elizabeth and her son Charles, then the Prince of Wales, are seen being presented with a copy of the official biography of the Queen Mother by author William Shawcross in 2009

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Prince Edward and Sophie, then the Earl and Countess of Wessex, enjoyed their honeymoon at Birkhall in 1999

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The Queen Mother watching the ceremony where she presented the 1st Battalion, The Black Watch,with new colours, at Birkhall

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Princess Elizabeth stoops to wipe baby Princess Anne’s nose before introducing her to Lieutenant Colonel Nielson, who commanded the 1st Argylls in Korea, during their summer holiday at Birkhall

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Prince Charles dancing with the Queen Mother during a staff party at Birkhall

Birkhall was used by the Queen Mother for half a century, after King George V lent it to her and her husband – the future George VI – when they were the Duke and Duchess of York.

The Queen Mother loved the home, she decorated it to her tastes and extensively developed the garden.

She only reluctantly swapped it for the grandeur of Balmoral Castle when her husband became King.

The young Princess Elizabeth then spent time there, before giving it back to her mother when she became Queen in 1952.

She and Philip had enjoyed the second part of their honeymoon there in 1947, after initially staying at Broadlands, the home of Earl Mountbatten.

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Princess Alexandra with her hew husband Angus Ogilvy, as they leave Crathie Church near Balmoral during their honeymoon at Birkhall, in 1963

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Duke and Duchess of Kent are seen en route to Birkhall shortly after their wedding, 1961

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Charles and Camilla at Birkhall in February 2005, two months before their wedding

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Charles and Camilla near Birkhall in 2007. The couple enjoy celebrating their wedding anniversary there

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Prince Charles with his sister Princess Anne sin in prams at Birkhall in 1951

The home is named after the birch trees which surround it. It dates back to 1715 and was bought by Queen Victoria and Prince Albert for their son in 1849.

But he never liked it and stayed there only once.

As the Prince of Wales, Charles stayed there frequently, including with his sons William and Harry.

Princess Diana famously refused to join Charles there for holidays when their marriage deteriorated.