My first thought was must be Yorkshire - wasnt disappointed -
"Robert Sheldon, a British engineer who’d been brought on to NAL to find “shortcuts and money-saving ideas,” suggested a ferret, equipped with a cleaning tool, could do the job, scampering through the vacuum tubes as if flushing rabbits out of a warren. “In his part of Yorkshire, hunters used ferrets,”"
"Robert Sheldon, a British engineer who’d been brought on to NAL to find “shortcuts and money-saving ideas,” suggested a ferret, equipped with a cleaning tool, could do the job, scampering through the vacuum tubes as if flushing rabbits out of a warren. “In his part of Yorkshire, hunters used ferrets,”"