Mostly men in their 40s, decked out in the black leather, dark sunglasses and pompadours of American 1950s greasers, they blast Japanese rockabilly tunes from a boombox and dance coolly in pointy-toed shoes.
Haley Jackson, a 23-year-old dance instructor, managed to shake hands with the prince as she and some friends delivered clothes, shoes and toiletries to the leisure centre.