On Friday morning, he was admitted to the London Clinic for treatment for an enlarged prostate. The Queen was with him, and he is understood to have visited the Princess of Wales before his surgery. 

The Princess had been recuperating at the London Clinic after undergoing abdominal surgery last week, and was discharged on Monday.

The King received his diagnosis nearly two weeks ago, approving a statement from Buckingham Palace to give details of his condition in the hope of raising awareness of its symptoms. 

NHS England said that after Charles shared news of the diagnosis, the “enlarged prostate” page on the NHS website received 26,170 visits in 48 hours, including another 9,760 visits on Thursday, compared with a daily average of 1,400 visits earlier in the week.

Prostate Cancer UK had 8,025 visits to its online risk check service, of which 6,800 were noted as high risk, more than double the previous day.