The King is known for being a workaholic, and even the Queen said after his cancer diagnosis that he “won’t slow down and won’t do what he’s told”.
Camilla told author Lee Child at her Reading Room literary festival last year that her husband was “doing fine” but was not heeding her advice.
On Thursday, the King “required a short period of observation in hospital” after experiencing side effects from his cancer treatment.
A busy away day to Birmingham has been cancelled, and his diary could be altered next week, after his medical team advised the King it would be wiser to postpone his engagements as a precautionary measure.
But a hectic state visit to Italy in just 10 days’ time is said to be going ahead.
Following his return from hospital to Clarence House, Charles was said to be working on state papers and making calls from his study on Thursday evening.
