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Privacy campaign group Big Brother Watch says age check technology "shouldn't be seen as a silver bullet solution".

Ministers have insisted there is no single "silver bullet" for solving the problem of illegal migration and the latest scheme is only one of a number of options being considered.

There’s no silver bullet available, although raising taxes on the rich and raising the minimum wage would help a great deal.

But he warned there was not a "silver bullet response" or "some policy lever that can be pulled".

Public ownership of the UK's railways is not a "silver bullet" for guaranteeing a better service for passengers, the transport secretary has said.