But the opening of Aire Ancient Baths on March 15 makes me wonder, what did hedonistic Roman bath fans in the Big Apple do before this?

FORBES: Ancient Roman Baths Make Comeback - In New York City

The Roman bath revival began 15 years ago in Spain, when Grupo Aire opened Aire of Sevilla in a 16th century palace, once home to actual Roman baths.

FORBES: Ancient Roman Baths Make Comeback - In New York City

Algae growing in Bath's Roman Baths could be used to make fuel for cars, according to new research.

BBC: Bath's Roman Baths algae could fuel cars

Later on Thursday they will travel by car through Somerset villages on their way to Bath for a tour of the Roman Baths, the Pump Room, the Guildhall and the Abbey.

BBC: Queen continues West Country tour

Mr May has also worked as a technical adviser for other start-ups, including Picochip, which is based in nearby Bath, a city famous for its Roman spa.

ECONOMIST: Tech clusters