I don’t think either the Prince or I will ever forget the visit of eccentric comedian Spike Milligan who stayed over at Highgrove one Saturday night. He didn’t want to be valeted and alarm bells rang when he didn’t show for breakfast. We later discovered that he hadn’t slept a wink in his four-poster bed because, for some inexplicable reason, he had spent the night stretched out on the hard bathroom floor of the ‘Blue Room’. Some weeks later, he sent a specially made china plaque through the post with written instructions that it be screwed to the bathroom floor. The plaque read: 'Spike Milligan slept here.’ Prince Charles found it hilarious.