King Charlesannounced he was diagnosed with cancer earlier this year, but an insider claimed the monarch had a previous brush with it before ascending to the throne. “Cancer is a very scary word if you’re a king or anyone else. It’s a big shock. But he is a great one for taking things on the chin,” a source told Robert Hardman for Charles III: New King. New Court. “‘How are we going to get on with this?’ He was very clear that he would carry on doing all of the constitutional stuff in exactly the way that he did before,” the source continued. While serving as the Prince of Wales, Charles learn…