“I’d like to make sure there’s really clear understanding in place about what we do should things go wrong: a dam in the wrong place, a bunch of trees sawn down; I don’t want to see them eating their way through what they call a temperate rainforest,” he said.

Milton added he would like to see “a broader policy” instead of a “piecemeal approach” to reintroducing native species.

The National Trust said it had been working closely with farmers and speaking to residents and neighbours ahead of the release.