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In 1976, Ferguson's built one such vessel for Lothian Regional Council named Gardyloo - after the traditional warning cry given by the Edinburgh residents before they emptied their chamber pots out of tenement windows.

Gardyloo soon became an unlikely visitor attraction.

By the time an EU directive abruptly ended sewage dumping at sea in 1998, Gardyloo had carried more than 6,000 passengers.

The Gardyloo boat was previously used to transport and release treated sewage into the Forth but that ended in 1998.

He opens his mouth to shut Logan up, when Logan suddenly hollers, “Gardyloo!” and slings the contents of the wastebasket across the front of the room.