The King will today return to public duties after doctors said they were pleased with his progress following cancer treatment earlier this year.
Charles, who has been patron of Macmillan Cancer Support for more than 20 years, will make a trip to a treatment centre on Tuesday.
He will be accompanied by the Queen, who is president of cancer support charity Maggie’s.
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Watch: King Charles returns to public engagements with Queen Camilla in cancer centre visit
Watch the MailOnline stream showing King Charles' first public egagement since his cancer diagnosis was revealed.
Queen Camilla will join the King on the visit to a cancer centre.
Watch: King Charles meets with cancer patient Lesley Woodbridge who is undergoing her second round of chemotherapy
Video has emerged of King Charles meeting with cancer patient Leslely Woodbrighde, who is undergoing her second round of chemotherapy, and husband Roger.
King Charles wears a dinosaur tie as he arrives at the cancer centre
King Charles was wearing a pink tie with white dinosaurs on his visit to University College Hospital centre.
Charles and Camilla meet with cancer patient undergoing second round of chemotherapy
King Charles and Queen Camilla have met with Lesley Woodbridge, who is receiving her second round of chemotherapy for sarcoma, and her husband Roger Woodbridge during a visit at the University College Hospital Macmillan Cancer Centre.
Charles and Camilla were also shown the facilites in a tour of the hospital.
Watch: Smiling King Charles and Queen Camilla shake hands and meet staff at cancer centre
King Charles and Queen Camilla were in jubilant spirits for their first public engagement since the King's cancer diagnosis.
Watch the couple waving to the crowd and meeting staff below:
King becomes new patron of Cancer Research UK
King Charles has agreed to become the new patron of Cancer Research UK, it can be announced today.
The monarch will be able to bring his experience to the position having undergone treatment for an unspecified form of cancer this year.
One of the charity's research centres is based at University College Hospital where the King and Queen Camilla are visiting this morning.
MailOnline understands the hosptial was not chosen because it has a link with the King's treatment or form of cancer, which has not been disclosed.
Queen Camilla waves to crowds as King Charles grins on way to first public engagement since cancer diagnosis
King Charles was seen in good spirits on his way to his first public engagment since he was diagnoses with cancer.
Queen Camilla was waving to the crowds as the jubilant couple returned to work.
King Charles is 'overjoyed to be back on public facing duties', says Daily Mail Royal Editor
King Charles is 'overjoyed to be back on public facing duties' for the first time since his cancer diagnosis, writes Daily Mail Royal Editor Rebecca English.
Breaking:Charles and Camilla pictured on his first public engagement since the King's cancer diagnosis
King Charles and Queen Camilla waved to the crowd after emerging from their car on their visit to a cancer centre in central London.
King Charles and Camilla have entered the cancer centre
After briefly meeting staff from the University College Hospital Macmillan Cancer Centre in London, the couple entered the building.
King Charles has arrived at the central London cancer centre
King Charles and Queen Camilla are shaking hands with officials from the University College Hospital Macmillan Cancer Centre in London after they emerged from their car.
King Charles returns to public-facing duties
The King will visit a cancer treatment centre with Queen Camilla this morning as he returns to public-facing duties for the first time since he was diagnosed with cancer earlier this year.
On Friday, Buckingham Palace released an update on the monarch's health to say he was responding positively to treatment and would be returning to engagements although his diary will remain "carefully calibrated".
MailOnline will bring you the latest news, reaction and analysis on the King's visit.
Key Updates
Watch: King Charles meets with cancer patient Lesley Woodbridge who is undergoing her second round of chemotherapy
Charles and Camilla pictured on his first public engagement since the King's cancer diagnosis
Watch: King Charles returns to public engagements with Queen Camilla in cancer centre visit