Thanks to Val from Whitby for your post. Thanks to maryeliza, Maggie and others who continue to explain that this incident is not only about images on mugs.
So far as I've seen, none of those who minimise/defend/accuse 'the PC brigade" of having no sense of humour etc etc etc, have responded to maryeliza's question about how they'd respond if the mugs in question had held racist images, or comments or been aimed at people with disabilities.
The King is to resume some duties.