Sam Woodhead says that he intends to continue his travels in Australia and beyond, despite his ordeal in the outback.
The teenager from Richmond is on a gap-year trip and plans to visit the Himalayas before returning home.
His mother, Claire Derry, who flew out while he was still missing, says she will take a short holiday with him in Brisbane.
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British Transport Police confirmed the trio have been charged with obstructing trains or carriages on the railway by an unlawful act.
The white hedgehogs were found huddled up in a cardboard box with newspaper and a fleece.
The demonstration, dubbed #OperationShutdown, saw supporters initially gather near Downing Street.