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The rats can check an area the size of a tennis court in about 30 minutes, the charity says, whereas a human with a metal detector might take four days to clear the same land.

Ron Walters, 76, from Kingswinford, West Midlands, found the coin with his metal detector in Wall Heath near Dudley last year.

He says he was scouring a field with a metal detector on the Danish island of Taasinge, when he unearthed the metal object.

When discovered by a police officer with a metal detector on a cold November morning last year, the iPad was found caked in mud having been underwater for more than five years.

That’s on top of other added expenses: enhanced security systems at his home, the necessary use of metal detectors at town hall meetings and while appearing in the districts of other lawmakers.