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BBC Scotland News understands that the Scottish government is confident that the vast majority of schools in Scotland already offer single-sex lavatories.

"We take this opportunity to urge passengers to use lavatories only for the purposes that they are meant for," it said.

Others associated the slogan with demand for lavatories.

Mr Jackson said six or seven police officers then boarded the plane and he overheard a flight attendant say a woman had been going from one lavatory to the other during the flight.

Lambton, a photographer, traveled all over Britain to bring us this visual history of the lavatory.