Clare Garnsey, associate medical director of Greater Manchester Cancer Alliance, said his message was "very powerful". The King, who revealed his diagnosis in February last year, is not described as being in remission or "cured" but the regularity of his treatment will be significantly reduced in the new year.

King Charles will share details of his experience with cancer and give an update on his treatment in a personal message broadcast on British television on Friday, Buckingham Palace said.

Charles’ decision to disclose his diagnosis was a departure for Britain’s royals, who have traditionally considered their health to be a personal matter and shared few details with the public.