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The 75-year-old monarch, who became king in September 2022 after the death of his mother Elizabeth II, was admitted for surgery for a benign prostate condition in January but was subsequently diagnosed with an unrelated cancer.
He has postponed all public-facing duties while he undergoes treatment, but is continuing with behind-the-scenes work and has been holding some in-person meetings.
“In recent weeks, I have been most deeply touched by your wonderfully kind and thoughtful good wishes for my health,” he said in a pre-recorded speech to mark the 75th anniversary of the Commonwealth.