Burnham has previously spoken about his father, who had Alzheimer's, when explaining why he was so determined to reform adult social care in England.

The PM had been due to host a meeting of business leaders in Downing Street later.

He revealed his father did not know he had become prime minister in July, because of his condition.

Prior to entering No 10, he told the Times newspaper it was "a sadness, because he would be [proud]".

"The way I look at it, it's his achievement as well. A whole family achievement, although he doesn't know it."

He later said care home staff had shown his father footage of him entering Downing Street, calling it a "wonderful" thing.

Burnham referred to his father's experience when pledging social adult social care reforms in July, saying he wanted to help "my dad and the millions like him".

He said he had been "overwhelmed" by the skills and professionalism of care workers supporting his father.

Burnham has described how his father, a former telephone engineer, had raised him with "laughter, love and support" alongside his mother Eileen in Culcheth, Cheshire.

In his 2024 book Look North, he wrote that neither of his parents had attended university, but could have done had they "grown up in a different time and different place".

"Their knowledge of that fact seemed to make them all the more determined that their three sons would go."

Opposition politicians have offered their condolences to Burnham and his family.

"No matter how old you are, or how much you try to prepare, losing your father is a profoundly painful experience," Conservative leader Kemi Badenoch wrote on social media.

"A part of your life that has always been there is suddenly gone forever and it can feel as though a part of you won't ever be the same again."

Liberal Democrat leader Sir Ed Davey said: "My heart goes out to the prime minister on the loss of his dad.

"From our conversations he sounded like a wonderful man."

Green party leader Zack Polanski said: "There are moments in life such as this sad time that transcend politics and I join the whole country in sending condolences."