Britain's national flag, the Union Jack, was spotted upside down during King Charles and Queen Camilla's visit to Arlington National Cemetery.

RUGBY, England—Stuart Field raised his first flags in July: the English red cross of St. George and also a smattering of the British red, white and blue, hanging them from his hometown’s streetlights.

England’s distinctive red-and-white St. George’s Cross and iconic Union Jack flags are making a comeback across the United Kingdom, with supporters calling the resurgence patriotic while critics in ...