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The result makes them look terrifying but still human, which is particularly important when they interact with the children in some of the more strangely lighthearted scenes.

The father-of-five added knife crime would not be eradicated "as long as humans walk this planet", but he hoped to "inspire self-confidence" through self-defence.

The access was tied to a number of conditions including free market policies, labour and human rights and political pluralism.

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.

“The demand is global. Audiences everywhere are craving stories that grip the human spirit ... and inspire us with real-life heroes.”