The 75-year-old monarch was pictured in the back of a car alongside Queen Camilla, 76, as the pair were driven to Clarence House, his longtime residence in London, on Tuesday morning.

PEOPLE understands that King Charles has returned to London for hisongoing cancer treatment appointmentsand meetings with palace staff.

The King’s return to London comes after he and Queen Camillaattended a church serviceat St. Mary Magdalene Church in Sandringham, Norfolk on Sunday. The monarch waved at photographers as he made his way to the church alongside his wife. It was his first public outing since hebegan his cancer treatmentlast week.

King Charles was photographed on Tuesday morning.Jordan Pettitt/PA Images via Getty Images

King Charles III and Queen Camilla arriving back at Clarence House in London after spending a week at Sandringham in Norfolk, following the announcement of King Charles III’s cancer diagnosis

Jordan Pettitt/PA Images via Getty Images

King Charles and Queen Camilla arrive at Clarence House in London on Tuesday morning.Jordan Pettitt/PA Images via Getty Images

King Charles III and Queen Camilla arriving back at Clarence House in London after spending a week at Sandringham in Norfolk, following the announcement of King Charles III’s cancer diagnosis

“It is equally heartening to hear how sharing my own diagnosis has helped promote public understanding and shine a light on the work of all those organisations which support cancer patients and their families across the U.K. and wider world,” the statement continued. “My lifelong admiration for their tireless care and dedication is all the greater as a result of my own personal experience.”

King Charles III and Queen Camilla arriving back at Clarence House in London after spending a week at Sandringham in Norfolk, following the announcement of King Charles III’s cancer diagnosis

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The palace announced that the King had been diagnosed with cancer on Feb 5. The announcement, which did not specify what form of cancer King Charles was diagnosed with, came a week after hissurgery for an enlarged prostate.

Adds a palace insider: “He will want to get on with the job. But that will depend on what treatment he is having. It may be utterly draining on him. He will need a lot of support.”

source: people.com