Charles was very intent to use his years as Prince of Wales to make his mark while he still had freedom of maneuver that he wouldn't have as King. The first subject he really went for was architecture. It made an impact.
What it was at the time was literally a plea for, to get the pressure off for a while, to give her space to breathe. She was very unhappy. She was feeling pretty claustrophobic.
I remember a moment when the Prince went back to his old school, Grammar School in Melbourne, and slightly to his horror his old music teacher produced a cello.
When the young Princesses Elizabeth and Margaret were growing up, that was at it's height and the War cemented that with photographs of the Royal Family having breakfast together and so on, by pinning their reputation so firmly on that particular issue.
Well the wedding in the words of the Archbishop of Canterbury was a fairy tale and there was a huge public impress, investment of goodwill, affection and indeed money in this Institution. It was a huge success at the time.