King Charles III will deliver his traditional Christmas Day message from a former hospital chapel, Buckingham Palace said on Monday, in a break from tradition and a nod to the monarch's ongoing treatment for cancer.

Charles recorded his message on December 11, one of the rare times a building outside the royal estate has been used, with the late Queen recording her message at Southwark Cathedral in 2006 and at Combermere Barracks in Windsor three years earlier.

The King was said to be "absolutely enchanted" by the space — and broke tradition in filming there King Charles switched up tradition this Christmas and recorded his traditional holiday broadcast as sovereign from a former hospital chapel instead of a royal residence at the end of a difficult year in which he and Kate Middleton were both diagnosed with cancer.