His Majesty has filmed a intimate address regarding his battle with cancer, scheduled for transmission as part of this year's fundraising drive, organised by a leading cancer charity and Channel 4.
Official sources said the King would talk about his "path to recovery" as a cancer patient, in a recorded address on Friday evening at 20:00 GMT.
The message, taped inside his London residence a fortnight ago, will stress the critical nature of cancer screening checks to increase the likelihood more people detect the illness at an treatable phase.
This will be a uncommon insight on the health of the Sovereign, who has been in a course of therapy since revealing his diagnosis in the start of 2024. Analysts suggest doubtful the King will identify his specific form of cancer.
The Stand Up To Cancer campaign each year collects money for medical research and therapies and prompts people to get health assessments to improve the chances of an timely detection.
The King's public discussion about his illness, and his experience as a patient, has been aimed to promote education and to get more people to get checked - and this will be advanced with this unusual personal contribution.
Up until now the King's main approach to his cancer has been to keep working, upholding a hectic timetable despite his frequent sessions of therapy, and he seems not to have sought to be defined by his condition.
The past twelve months has seen the Sovereign, undertaking several foreign visits, notably to Italy and Canada, and hosting the biggest number of inward state visits to the UK for a generation, featuring the German president last week.
The upcoming awareness programme on television, presented by well-known figures including several TV personalities, will urge people not to be frightened of getting cancer checks.
All three have been affected by cancer - one host disclosed in November she had had an operation for breast cancer, while Balding was treated for the illness over a decade ago. Presenter Adam Hills has previously spoken about his parent, who had one form of cancer and then later leukaemia.
The programme will reach out to the roughly nine million people in the UK who charities says are not compliant with NHS screening schemes, with an digital tool to let people see if they are qualified for examinations for several common cancers.
In an attempt to explain cancer checks and show the value of early diagnosis there will be a live broadcast from treatment centres at two Cambridge hospitals in Cambridge.
"The goal is to take the fear surrounding health checks and demonstrate everyone that they are not alone in this," commented a presenter.
At present in the UK, there are several key publicly available checks - for specific cancers - available to eligible individuals.
A recently launched preventative initiative is also being slowly rolled out for people at potential risk of developing the illness, focusing on people of a certain age, who have a smoking history or used to.
Male patients may request prostate cancer checks, but there is not a universal scheme operational.
The Stand Up to Cancer initiative, which has generated a significant sum over the past decade, is funding multiple research studies involving 13,000 patients.
His Majesty, in a address for attendees at a event for support groups in the spring, had discussed understanding the "daunting and at times scary experience" for patients and their families.
But he noted his personal journey of coping with cancer had demonstrated that "periods of great challenge of sickness can be alleviated by the kindness of others," as he commended those who cared for those receiving treatment.
Royal representatives has not made public the nature of cancer the King has, or the medical care he has undergone. The King's cancer was discovered after he had undergone a prostate procedure.
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