The verse about the Prince of Wales refers to an incident that occurred when Charles was about 13 or so--somehow temporarily on his own, he ducked into a pub to get out of the rain and away from pursuing press. Once in the pub, he thought he had to buy something, and the only thing he could think of was cherry brandy. (This is the official version.) Of course he was underage, and the press made a big deal out of it, much to the Royal Family's embarassment.